Non-default application selection during a transaction

ABSTRACT

During recent years, chip-based transactions has been changing from mainly physical, like a chipcard, to mainly virtual, such as a software application on a mobile device. Although such mobile devices are very powerful compared to a conventional chip card, the data interactions with POI terminals must still be compliant with relevant specifications and standards such as the EMV standards. 
     A computer implemented transaction method is provided that enables a first application to be switched with a second application whilst the transaction is in progress, and without loss of information relating to the transaction. The switching process can be facilitated by either instructing a user to remove an identification device, such as a mobile phone or a chipcard, out of a field produced by a terminal and subsequently return the identification device to within the field produced by the terminal, or turning an antenna of the identification device off, waiting a predetermined length of time and turning the antenna back on again. This enables the transaction to be completed using an optimal application whilst also providing a positive user experience throughout.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of U.S. patent application Ser. No. 16/597,365, filed Oct. 9, 2019, which claims priority to European Application Serial No. 18203146.8, filed Oct. 29, 2018. This application also claims priority to European Application Serial No. 19156280.0, filed Feb. 8, 2019. Each of the foregoing applications is incorporated herein by reference in its entirety

FIELD OF INVENTION

The present disclosure generally relates to transaction methods between Points of Interaction (POI) terminals and identification devices.

BACKGROUND

Electronic authorisation systems for payment transactions use standard specifications, such as those managed by EMVCo LLC which are publicly available at https://www.emvco.com/document-search. EMV is a technology toolbox that enables globally interoperable secure payments across both face-to-face and remote environments. EMV refers to all of the specifications administered by EMVCo.

EMVCo has standardized the exchange between contactless chips and POI terminals. The EMV implementation is documented, for example, in the EMV Contactless Specification, version 2.7, currently publicly available at: https://www.emvco.com/emv-technologies/contactless/.

The latest version of the EMV Contactless Specifications includes:

-   -   Book A: Architecture and General Requirements—version 2.7 (9 May         2018);     -   Book B: Entry Point—version 2.7 (9 May 2018);     -   Books C: Kernel Specifications—version 2.7 (9 May 2018);     -   EMV Contactless Interface Specification - version 3.0 (February         2018); and     -   PPSE and Application Management for Secure Element—version 1.0         (May 2017).

During recent years, chip-based payment has been changing from mainly physical, like a chipcard, to mainly virtual, such as a software application on a mobile device. Although such mobile devices (equipped with large screens, digital keyboards, fingerprint/iris scanner, etc.) are very powerful compared to a conventional chip card, the data interactions with the POI terminal must still be compliant with the EMV specifications and standards. These standardized data interactions are very limited, and make the implementation of new functionalities very difficult. Although these standards are regularly updated, it takes years before the standards are agreed and implemented.

It is an object of the invention to provide additional data interaction functionalities compatible with already deployed or even legacy devices, e.g. devices operating within the limitations of the current EMV contactless specifications.

GENERAL STATEMENTS

According to a first aspect of the present disclosure, a computer-implemented transaction method performed by a processor of an identification device is provided, the method comprising: operating an environment including an application list comprising at least one first application parameter that is associated with a first application; transmitting, to a Point of Interaction, POI, terminal and using an antenna of the identification device, the application list; receiving, from the POI terminal and using the antenna, a first request for confirmation that a transaction should proceed using the first application; applying one or more rules to data contained within the first request; determining, based on the application of the one or more rules, that the transaction is to proceed using a second, different application instead of the first application; transmitting, to the POI terminal and using the antenna, a response for restarting the transaction; modifying the application list to generate a modified application list, the modified application list comprising at least one second application parameter that is associated with the second application; performing a further action comprising: displaying a user-intelligible instruction on a display of the identification device, the user-intelligible instruction requesting that the identification device is removed from a field generated by the POI terminal and subsequently placed back within said field; or disabling the antenna and subsequently enabling the antenna after a predetermined time has elapsed; transmitting, to the POI terminal and using the antenna, the modified application list; receiving, from the POI terminal and using the antenna, a second request for confirmation that the transaction should proceed using the second application; and transmitting, to the POI terminal and using the antenna, a response to the second request. By implementing such a function selection, new non-EMV compliant functionalities may be quickly added to existing payment-system specific kernels—this provides a mechanism to avoid transactions being performed using a particular payment application (or payment card) that is sub-optimal in the context of the current transaction and available set of payment applications. By quickly providing new functionalities, the migration to improved ID devices and new payment applications may be accelerated. A first and second application represent the simplest implementation—the same approach may also be used for more than two payment applications.

In addition, by restarting the existing payment transaction instead of starting a new one, it may be quickly restarted using the same amount and the same currency without the need of any merchant interaction. By using existing mechanism already present in the EMV specifications and protocols, Users are given a higher degree of control over the payment applications used to complete payment transactions, and unexpected payments and/or unexpected terminations of payments are less likely to occur when a conflict arises between the contents of the PPSE and the POI terminal capabilities. According to a second aspect of the present disclosure, modifying the application list to generate the modified application list further comprises: removing the at least one first application parameter from the application list; and adding the at least one second application parameter to the application list.

According to a third aspect of the present disclosure, the application list further comprises: the at least one second application parameter, a first application priority value; and a second application priority value; wherein modifying the application list to generate the modified application list further comprises: modifying the first priority value and/or the second priority value such that a priority of the second application is higher than a priority of the first application.

According to a fourth aspect of the present disclosure, the response for restarting the transaction is a response that causes the POI terminal avoid having to carry out a pre-processing stage in which at least a payment amount and payment currency are specified.

According to a fifth aspect of the present disclosure, the response to the second request comprises an authorization message or a decline message.

According to a sixth aspect of the present disclosure, the user-intelligible instruction comprises text and/or at least one image.

According to a seventh aspect of the present disclosure, the one or more rules comprise any one or more of the following: a currency rule specifying that the response for restarting the transaction is to be transmitted where it is determined that a currency of the transaction does not match a currency associated with the first application, and that a currency associated with the second application does match the currency of the transaction; a threshold value rule specifying that a response for restarting the transaction is to be transmitted where it is determined that a value of the transaction exceeds a threshold value associated with the first application, and that the value of the transaction does not exceed a threshold value associated with the second application; and a merchant identity rule specifying that compatible response for restarting the transaction is to be transmitted where it is determined that a POI terminal merchant identifier that is associated with the POI terminal does not match a merchant identifier associated with the first application, and that the POI terminal merchant identifier does match a merchant identifier associated with the second application.

According to an eighth aspect of the present disclosure, the identification device comprises a contactless chipcard or a software application executing on a mobile device, preferably wherein the mobile device is a mobile phone.

According to a ninth aspect of the present disclosure, the method further comprises: transmitting, to the POI terminal and using the antenna, a request for a merchant unique identifier; and receiving, from the POI terminal and using the antenna, a message including a field populated with the merchant unique identifier; wherein determining, based on the application of the one or more rules, that the transaction is to proceed using the second, different application instead of the first application further comprises: determining that the second application is associated with the merchant unique identifier; and based on the determining, selecting the second application for continuing the transaction.

According to a tenth aspect of the present disclosure, the invention provides a non-transitory computer-readable medium storing program instructions that, when executed by a processor of an identification device, cause the identification device to: operate an environment including an application list comprising at least one first application parameter that is associated with a first application; transmit, to a Point of Interaction, POI, terminal and using an antenna of the identification device, the application list; receive, from the POI terminal and using the antenna, a first request for confirmation that a transaction should proceed using the first application; apply one or more rules to data contained within the first request; determine, based on the application of the one or more rules, that the transaction is to proceed using a second, different application instead of the first application; transmit, to the POI terminal and using the antenna, a response for restarting the transaction; modify the application list to generate a modified application list, the modified application list comprising at least one second application parameter that is associated with the second application; perform a further action comprising: displaying a user-intelligible instruction on a display of the identification device, the user-intelligible instruction requesting that the identification device is removed from a field generated by the POI terminal and subsequently placed back within said field; or disabling the antenna and subsequently enabling the antenna after a predetermined time has elapsed; transmit, to the POI terminal and using the antenna, the modified application list; receive, from the POI terminal and using the antenna, a second request for confirmation that the transaction should proceed using the second application; and transmit, to the POI terminal and using the antenna, a response to the second request.

According to an eleventh aspect of the present disclosure, the instructions further cause the processor to perform the method of any of the second to ninth aspects.

According to a twelfth aspect of the present disclosure, an identification device comprising a processor is provided, the processor configured to cause the identification device to: operate an environment including an application list comprising at least one first application parameter that is associated with a first application; transmit, to a Point of Interaction, POI, terminal and using an antenna of the identification device, the application list; receive, from the POI terminal and using the antenna, a first request for confirmation that a transaction should proceed using the first application; apply one or more rules to data contained within the first request; determine, based on the application of the one or more rules, that the transaction is to proceed using a second, different application instead of the first application; transmit, to the POI terminal and using the antenna, a response for restarting the transaction; modify the application list to generate a modified application list, the modified application list comprising at least one second application parameter that is associated with the second application; perform a further action comprising: displaying a user-intelligible instruction on a display of the identification device, the user-intelligible instruction requesting that the identification device is removed from a field generated by the POI terminal and subsequently placed back within said field; or disabling the antenna and subsequently enabling the antenna after a predetermined time has elapsed; transmit, to the POI terminal and using the antenna, the modified application list; receive, from the POI terminal and using the antenna, a second request for confirmation that the transaction should proceed using the second application; and transmit, to the POI terminal and using the antenna, a response to the second request.

According to a thirteenth aspect of the present disclosure, the processor is further configured to cause the identification device to perform the method of any of the second to ninth aspects.

According to a fourteenth aspect of the present disclosure, the identification device is one of: a contactless chipcard; and a mobile phone

BRIEF DESCRIPTION OF THE DRAWINGS

Features and advantages of some embodiments of the present invention, and the manner in which the same are accomplished, will become more readily apparent upon consideration of the following detailed description of the invention taken in conjunction with the accompanying drawings, which illustrate preferred and exemplary embodiments, and which are not necessarily drawn to scale, wherein:

FIG. 1 depicts a typical identification transaction;

FIG. 2 depicts an improved payment transaction;

FIG. 3 depicts part of an EMV-compliant payment transaction and the Entry Point High Level Architecture;

FIG. 4 depicts part of an improved EMV-compliant payment transaction and the Entry Point High Level Architecture;

FIG. 5A depicts part of an improved transaction and the Entry Point High Level Architecture; and.

FIG. 5B depicts part of yet another improved transaction and the Entry Point High Level Architecture.

DETAILED DESCRIPTION

The invention relates to transactions involving a Point of Interaction Terminal (POI), an identification device and at least two applications that support the transaction. The following disclosure sets out exemplary embodiments in the context of EMV-compatible payment transactions. However, it will be understood that the invention has applicability outside of the EMV framework, and indeed outside of transactions that involve taking of a payment. The invention has applicability in any context where a transaction of some form in taking place, where the transaction is facilitated by an identification device having access to at least two applications, e.g. signing in and out of a travel network using an electronic device having a short-range wireless communication function.

The term ‘EMV-compliant’ or ‘EMV-compatible’ as used herein is understood to mean an activity that is within the EMV specification as discussed in the background section of this specification. An ‘EMV-compliant request’, or equivalently an ‘EMV-compatible request’, is a request that conforms to all relevant requirements of the EMV specification. An EMV-compliant/compatible request can thus be understood and actioned by any electronic device that supports the EMV standard without deviation from said standard.

A typical payment transaction 100 is shown in FIG. 1—a User or Consumer 130 wishing to make a payment transaction may carry an identification device 120 (or “ID device”). In general, payment transactions 100 comprise an initial identification, after which an authorization transaction may also occur. An authentication transaction may also be initiated to further prove the identity of the consumer 130, although in many cases, possession of the ID device 120 is sufficient.

To initiate the payment transaction 100, a POI terminal 110 is provided comprising a processor, the processor being programmed to execute payment transactions 100 with one or more ID devices 120. In most cases, it is advantageous to support a plurality of types of ID devices 120, such as contactless ones 122, 124, to maximize convenience for consumers 130. By interacting in accordance with a standard EMV

Contactless payment transaction protocol, a high degree of interoperability may be achieved.

A POI terminal 110 may be implemented in any convenient combination of hardware and software to provide interoperability with the ID devices 120 supported—for example, it is frequently comprised in a POS (Point of Sale) system 112 and ATM's. Depending on the types of ID devices 120 supported, one or more contactless interaction channels 140 may be provided to transfer data between the POI terminal 110 and the ID device 120—these may use, for example, close coupling, proximity coupling, electromagnetic radiation, visible or non-visible light, radio-frequency or any suitable combinations thereof. A POI terminal 110 may optionally comprise a POI display 115.

During the ID transaction 100, the POI terminal 110 typically first establishes whether the ID device 120 is a supported type. If so, it establishes whether the ID device 120 may be used for a payment transaction. Additionally or alternatively, other types of transactions such as an authentication transaction, an authorization transaction, a coupon-redeeming transaction, a bidding transaction, a quoting transaction, a negotiation transaction, or any suitable combinations may previously or subsequently occur.

The ID device 120, such as a contactless chipcard 122, also comprises a processor, which is also programmed to be compliant with the EMV contactless specifications and protocols to provide a high degree of interoperability.

ID devices 120 may be physical, like a chipcard 122, or virtual, such as a software application on a mobile device 124. In combination with interaction technology such as NFC or Bluetooth, a mobile device 124, such as mobile phone, may be used as a virtual contactless ID device 120 to initiate contactless transactions and to interact with merchant POI terminals 110. In particular, they may be used to initiate payment transactions 100. Such applications include, for example, Apple Pay, Android Pay, X Pay and Samsung Pay. These EMV-standardized data interactions are currently very limited—the ID device 120, even when comprised in a mobile device 124, limits itself to operation as a chipcard 122 in interactions with the POI terminal 110 to ensure a high degree of interoperability. Data interactions may also use interaction technology such as mobile data, LAN, USB, HTTP, HTTPS, XMPP, web sockets, FTP, or any combination thereof to provide one or more contactless interaction channels 140.

FIG. 3 depicts the use of the High Level Architecture of Entry Point 150, as described in FIG. 3-1—version 2.7—of Book B Entry Point Specification of the EMV Contactless Specifications for Payment Systems, as part of the standard payment transaction 100. A POI terminal 110 is provided which supports interoperability with a contactless ID device 120 using a suitable contactless interaction channel 140. For example, a contactless chipcard 122 or a mobile device 124 comprising a contactless ID device 120.

Entry Point 150 comprises five main functional sections:

1) Preliminary transaction processing 155 (hereafter called Pre-Processing 155). This is processing prior to the activation 157 of the contactless interface of the reader (comprised in the POI terminal 110) and before the User (Consumer) 130 is invited to present a contactless ID device 120 such as a contactless card 122 or a mobile device 124.

2) Protocol Activation 157: This is activation 157 of the contactless interface.

3) Combination Selection 160: This is selection of the Combination 160 to use for the transaction.

4) Kernel Activation 170: Entry Point 150 activates the selected kernel 170 and this begins the kernel processing 180.

5) Outcome Processing 190: Entry Point 150 processes 190 an Outcome 192, 194, 196 according to the type of Outcome and the values of the Outcome parameters.

Entry Point 150 includes four starting points:

Start A) 151—starts at Pre-Processing 155. It is activated by the reader 110 when Autorun is ‘No’. This is typical for a new transaction with a variable amount in an EMV mode acceptance environment.

Start B) 152—starts at Protocol Activation 157. It is activated in any of the following cases:

-   -   activated by the reader 110 when Autorun is ‘Yes’; this is         typical for a new transaction with a fixed amount in a         mag-stripe mode acceptance environment, or     -   activated by the reader 110 to handle issuer responses after an         Online Request 196 or End Application Outcome 196 with parameter         “Start=B” 152, or     -   handled internally by Entry Point 150 for an error situation, or     -   handled internally by Entry Point 150 for a Try Again Outcome         194

Start C) 153—starts at Combination Selection 160. It is activated in case of being handled internally by Entry Point 150 for a Select Next Outcome 192.

Start D) 154—starts at Kernel Activation 170. It is activated by the reader 110 to handle issuer responses after an Online Request Outcome 196 with parameter “Start=D” 154.

Each Start 151, 152, 153, 154 has conditions to be satisfied by the reader 110 or POI terminal 110 before Entry Point 150 is activated. The starting points 151, 152, 153, 154 support the functional requirements of the seven EMV kernels 180.

Each new contactless transaction 100 may begin at Start A 151 or Start B 152 depending on whether the transaction amount is variable or not. A transaction amount is invariable if for the given reader 110 configuration it is the same for a plurality of transactions such that Pre-Processing 155 may be pre-computed for this plurality of payment transactions.

Entry Point 150 activates the contactless ID device 120, and selects the appropriate kernel 180, which then conducts the contactless transaction with the ID device 120, until it finishes with an Outcome 192, 194, 196.

Try Again 194 and Select Next 192 Outcomes are immediately processed by Entry Point 150, which re-starts at the appropriate point 152, 153. All other 196 Outcomes are considered to be Final Outcomes 196 and processing reverts to the reader 10 and POI terminal 110. In some cases, such as Approved 196 or Declined 196 Outcomes, the transaction 100 is completed, and no further processing from Entry Point 150 and the kernel 180 is required. In other cases, such as an Online Request 196 Outcome, then after the reader 110 and POI terminal 110 have dealt with the expected functionality, if applicable, Entry Point 150 will be started at the requested Start 151, 152, 153, 154 so that a kernel 180 may complete the transaction 100.

The various start locations 151, 152, 153, 154 and the Outcome 190 concept allows Entry Point 150 to support a wide range of kernel 180 expectations. These concepts of Entry Point 150 processing are illustrated in FIG. 3.

Entry Point 150 is designed around the use of a Proximity Payment System Environment (PPSE) as the selection mechanism. For multi-brand acceptance, this allows a reader 110 to quickly obtain all the available brands and applications with a single command and to make an immediate choice based on priority and kernel availability.

Pre-Processing 155—Start A 151

Entry Point 150 is initiated at Pre-Processing 155 for a new transaction with a variable amount. Each reader 110 Combination (In other words, an Application Identifier (AID)—Kernel ID Combination) may have a set of Entry Point 150 Configuration Data, as defined in Table 5-2 of Book A (Architecture and General Requirements), Version 2.7, April 2018 of the EMV Contactless Specification.

The Configuration Data includes Cardholder Verification Method (CVM), floor limit(s), online/offline capability, extended selection support, and contactless transaction limit.

If present, these limits are examined during Pre-Processing 155. The result is a set of flags and data elements for each Combination; one of which will be used to define the attributes of the transaction. The flags and limits referenced in this section are all part of Entry Point Configuration Data as outlined in Table 5-2 of Book A (April 2018):

Entry Point Configuration Data=For each supported type of transaction, A set of static data for Entry Point 150 processing. The value of this data is persistent and represents transactional configuration information, such as contactless limits and CVM limits. Exceptional updates happen outside of transaction processing.

This table defines the available data set for each Combination. All configured data sets will be available for Entry Point 150 processing. All elements defined in this table are optional and may be omitted from a specific instance of a combination.

TABLE 5-2 Entry Point Configuration Data per Combination Status Check Support flag, if present Zero Amount Allowed flag, if present Reader Contactless Transaction Limit, if present Reader Contactless Floor Limit, if present Terminal Floor Limit (Tag ‘9F1B’), if present Reader CVM Required Limit, if present Terminal Transaction Qualifiers, if present Extended Selection Support flag, if present

The indicators referenced above are all part of Entry Point 150 Pre-Processing 155 Indicators as outlined in Book A, Table 5-3.

In some reader implementations, for instance a vending machine with identically priced goods, the results of Pre-Processing 155 do not vary per transaction and are made available as configuration data for Start B 152.

Pre-Processing 155 may set the Entry Point 150 Pre-Processing 155 Indicators per reader 110 Combination (AID—Kernel ID) as defined in Book A, Table 5-3.

Entry Point 150 uses data sets during Pre-Processing 155 to compute the Entry Point 150 Pre-Processing 155 Indicators for each combination, as defined in Table 5-3.

The indicators are made available to the kernel 180 selected by Entry Point 150. Entry Point 150 temporarily stores the computed indicators to support selection of another combination for the same transaction or reactivation of a kernel 180 after an Online Request Outcome 196.

In addition to the configuration data discussed above, each kernel 180 will need data that is specific to the transaction.

TABLE 5-3 Entry Point Pre-Processing Indicators Status Check Requested Contactless Application Not Allowed Zero Amount Reader CVM Required Limit Exceeded Reader Contactless Floor Limit Exceeded Copy of TTQ (if present as part of configuration data); for definition, see Table 5-4 of Book A

Entry Point 150 uses the ‘Contactless Application Not Allowed’ indicator to indicate that the transaction cannot take place for this Combination. A Copy of Terminal Transaction Qualifiers (TTQ) may be requested in the PDOL (with Tag ‘9F66’2) of contactless applications that require this data element to obtain indication of the reader contactless capabilities and transaction requirements.

Note that during Kernel Processing 180, one or more of the checks performed during Pre-Processing 155 may be repeated or even over-ruled, such as checking the transaction amount against the Reader Contactless Transaction Limit. In other words, in some transactions 100, the results from Pre-Processing 155 may have little influence on the transaction 100.

Protocol Activation 157—Start B 152

Protocol Activation 157 may be either the next step after Pre-Processing 155, or Entry Point 150 may be started at Protocol Activation 157 for new transactions with a fixed amount or as Start B 152 after Outcome Processing 190.

During Protocol Activation 157, polling is started for the contactless ID device 120, 122, 124 discovery (if this has not already been performed) and appropriate

User Interface messages may be provided. The retained Entry Point 150 Pre-Processing 155 Indicators and the Candidate List are available if required.

Combination Selection 160—Start C 153 Combination Selection 160 may be either the next step after Protocol

Activation 157, or Entry Point 150 may be started at Combination Selection 160 as Start C 153 after Outcome Processing 190, 192.

Combination Selection 160 addresses the payment application (or product) and kernel selection process 170, 180.

Entry Point 150 does not rely on an exclusive link between the payment application, defined by its Application Identifier (AID), and the kernel. A single payment application may run on different kernels. Within the reader 110, a Kernel ID is used to distinguish between different kernels 180 that may be supported.

The term Kernel ID is used to identify the kernel(s) 180 kept in the reader 110, and the term Kernel Identifier (tag ‘9F2A’) is used to identify the kernel(s) indicated by the ID device 120.

So, in addition to the AID, Entry Point 150 also needs information on which kernel 180 to activate 170. The combination of AID and Kernel ID is further referred to as a reader 110 Combination.

Following a method similar to the EMV contact application selection process, Entry Point 150 constructs a list of Combinations mutually supported by the ID device 120 and the reader 100. If multiple Combinations are supported by both ID device 120 and reader 110, Entry Point 150 selects the Combination with the highest priority.

For this purpose, the ID device 120 comprises a processor, programmed to provide a Proximity Payment System Environment (PPSE). The PPSE comprises a list of payment applications selectable over the contactless interaction channel 140.

Data exchanges between ID device 120 and POI terminal 110 are initiated using a Master-Slave protocol defined by the EMV specifications and protocols, where the POI terminal 110 acts as the Master, and the ID device 120 as the Slave. Commands are coded in bytes with a header to identify the command composed of Class byte, Instruction byte, P1 parameter byte and P2 parameter byte. The ID device 120 typically responds with a response payload, or byte array, accompanied by a Status Word of two bytes. In some cases, only a Status Word SW1 SW2 may be returned. The Status Word has the value ‘9000’ if the command has been successfully processed by the ID device 120 and a different value if an error occurs during processing in the ID device 120.

To recover the list of payment applications, Entry Point 150 sends a SELECT (PPSE) command 162 to the ID device 120.

The first File Control Information (FCI) 164 response is provided by the ID device 120 and contains a list of ADF names and kernel ID's—in other words, the contents of the PPSE. More specifically, it contains one or more Directory Entries identifying one or more payment applications supported by the ID device 120. Each entry may comprise, as described in EMV Contactless Book B, Table 3-3:

-   -   Application Definition File (ADF) Name of the payment         application     -   optionally an Application Label     -   an Application Priority Indicator     -   the Kernel Identifier of the kernel 180 required for the payment         application (for example, Mastercard kernel is 2)     -   optionally an Extended Selection (Entry Point 150 may append         this data element to the ADF Name in the SELECT Command

In the ID device 120, the payment application is indicated by its Application Definition File (ADF) Name.

The kernel required for a specific payment application is indicated by the Kernel Identifier (Tag ‘9F2A’).

The priority of the Combination is indicated by means of an Application Priority Indicator with a value of ‘1’ as the highest priority and ‘F’ the lowest. A value of ‘0’ means no priority is assigned and has the same priority as ‘F’.

In the reader 110, the payment application is indicated by the AID. Readers 110 must be able to link AIDs to Kernel IDs.

Entry Point 150 finds Combinations by matching pairs of data elements (ADF Name (Tag ‘4F’) and Kernel Identifier (Tag ‘9F2A’)) in the ID device 120 with pairs of data elements in the reader 110 (AID and Kernel ID)—matching pairs indicates compatibility.

Once all compatible (supported) Combinations have been found and the highest priority Combination has been identified, Entry Point 150 selects the associated payment application by sending a SELECT (AID) command 166.

The response to the SELECT (AID) command 166—is a second File Control Information (FCI) 175 from the ID device 120—which is received and processed by Entry Point 150, including status bytes SW1 SW2.

Combination Selection 160 may comprise the following steps:

-   -   A Candidate List is generated of compatible Combinations by         processing each Directory Entry from the first FCI 164. Each ADF         name is examined to see whether it matches (full match or         partial match) the AID of the reader 110 Combination. In         addition, other details, such as whether the Requested Kernel ID         is supported for the reader 110 Combination, may be used to         decide whether a Combination is added to the Candidate List.     -   If the Candidate List is empty, Entry Point sends an End         Application Outcome and continues with Outcome Processing 190,         196.     -   If there is only one Combination in the Candidate List, the         Entry Point 150 selects this combination using the SELECT (AID)         command 166.     -   If there are more than one Combination in the Candidate List,         the payment application priority (indicated using the         Application Priority Indicator in the PPSE Directory Entry).     -   The Application Priority Indicator may have the following         values:         -   0000: No priority assigned         -   xxxx: Priority order of the payment application to be             selected, ranging from 1-15, with 1 being highest priority     -   If a single Combination has a higher priority than any other         Combination, Entry Point 150 selects this combination using the         SELECT (AID) command 166.     -   If multiple Combinations have the highest priority:         -   Determine the order of these Combinations' ADF Names and             Kernel IDs in the PPSE, where the order is the position in             the PPSE, with the lowest order being the first.     -   Entry Point 150 selects the Combination with the lowest order         (the first one) using the SELECT (AID) command 166.

Kernel Activation 170—Start D 154

Kernel Activation 170 may be either the next step after Combination Selection 160, or Entry Point 150 may be started at Kernel Activation 170 as Start D 154 after Outcome Processing 190. In the event that Entry Point 150 is started as Start D 154, the second FCI 175 (and the Status Word) will not be needed for the selected kernel 180.

During Kernel Activation 170, Entry Point 150 hands over control to the kernel 180 of the selected 166 Combination. Once the kernel 180 is activated, all commands and responses are processed by the kernel 180.

Kernel Activation 170 typically requires:

-   -   Entry Point activating the kernel 180 identified in the selected         166 Combination.     -   Entry Point 150 making the Entry Point 150 Pre-Processing 155         Indicators (as specified in Book A, Table 5-3) for the selected         166 Combination available to the selected kernel 180.     -   Entry Point 150 making available the second FCI 175 and the         Status Word SW1 SW2 to the selected kernel 180. This requirement         does not apply if Entry Point 150 is restarted at Start D 154         after Outcome Processing 190.

Kernel Processing 180

The kernel processing 180 typically covers the interaction with the ID device 120 between the Final Combination Selection 166 and the Outcome Processing 190. Once activated 170, a kernel 180 continues the dialogue with the ID device 120 using the necessary command/response exchanges and may call for a User Interface Request from the reader 110 (e.g. displaying “Remove Card” on the optional POI display 115). On completion, the kernel 180 provides an Outcome 192, 194, 196 to Entry Point 150.

This ID transaction 300 proceeds as follows using the Application Protocol Data Units (APDU) as described in EMV specifications. The POI terminal 110 sends Command APDU's (C-APDU) 182 as Master to the ID device 120. The ID device 120 responds with Response APDU's (R-APDU) 184 as Slave to the POI terminal 110.

For example:

-   -   The POI terminal 110 may send a request 182 for the processing         options, to which the ID device 120 responds 184 with the file &         record structure to be retrieved.     -   The POI terminal 110 then reads all the indicated records by         sending a request 182 for the record, to which the ID device 120         responds 184 with the contents of that record.     -   This is continued, or looped, until all the indicated records         have been read.     -   Finally, this part of the data exchange is ended by the POI         terminal 110 requesting 182 the Application Cryptogram be         generated, followed by the ID device 120 responding 184 with the         Application Cryptogram 344.

Further data exchange may occur between the POI terminal 110 and the ID device 120, and further identification transactions may be performed.

Outcome Processing 190, 192, 194, 196

Each kernel 180 may finish its processing 180 by providing an Outcome 190 with parameters. Some Outcomes 190, such as Try Again 194 and Select Next 192 may be processed immediately by Entry Point 150 which re-starts processing at the appropriate start 152, 153. The rest 196, such as Approved and Online Request may be passed to the reader 110 as a Final Outcome 196 together with the parameters and associated data.

In addition, for exception conditions within Entry Point 150 processing, a Final Outcome 196 may be provided directly by Entry Point 150.

There are problems with such conventional EMV-compliant contactless payment transactions 100:

Problem 1): Many contactless ID devices 120 have a PPSE comprising only one payment application, which may not be compatible with all readers 100. For example, if this payment application in the PPSE is “American Express” and the POI terminal 110 is “Mastercard” only. In such a case:

-   -   No compatible payment application is found     -   The Candidate List is empty.     -   Entry Point 150 sends an End Application Outcome 196.     -   This is considered a Final Outcome 196, terminating the current         contactless transaction 100.     -   EMV Contactless Book A, Annex B.10 states: “the kernel (or Entry         Point 150) has determined that there has been an unrecoverable         error and processing should be terminated”. The Start parameter         is “N/A”, which means that Entry Point 150 is not restarted in         this case.     -   If the POI terminal 110 comprises a POI display 115, it may show         “Insert, Swipe or Try Another Card”.     -   The POI terminal 110 must initiate a new transaction 100—it         cannot continue the existing transaction 100.

This occurs automatically, and may be inconvenient for the User 130 who does not realise that what the problem is—the User 130 is confronted by a transaction termination and failure.

A payment transaction 100 is only possible in this case by starting a new payment transaction 100, requiring in most cases the amount to be provided again. Contact is re-established with ID device 120, and Entry Point 150 Pre-Processing 155 is repeated.

Reasons for only one payment application being comprised in a PPSE include, for example:

-   -   it is a physical chipcard 120, 122, supporting only one payment         application using a contactless interaction channel 140, because         that is how it was personalized and issued;     -   it is a mobile device 124, such as a phone, on which only one         virtual contactless card 120 has been digitized;     -   it is a mobile device 124, such as a phone, supporting many         digitized virtual contactless cards 120, but the User 130 has         pre-selected one for a subsequent transaction 100 (for example,         selected as default), and the PPSE only comprises the         corresponding payment application.

Problem 2): The ID devices 120 may have a PPSE comprising only two payment applications from different issuers which may not be compatible with all readers 100. The payment applications in this case include a priority indication.

For example, if a first payment application in the PPSE is “Mastercard” and a second is “American Express”, and the POI terminal 110 is “American Express” only. Note that here “first” and “second” are used in this disclosure to distinguish between two instances of a payment application—the terminology does not imply or exclude an order in the PPSE. In this case, the PPSE is programmed to provide the first payment application “Mastercard” with a higher priority than “American Express”—by, for example, the “Mastercard” Directory Entry comprising an Application Priority Indicator of 1 and the “American Express” Directory Entry comprising an Application Priority Indicator of greater than 1; or by assigning the same Application Priority Indicator to both payment applications and assigning the “Mastercard” payment application a lower order (placing it first in the PPSE); or by not assigning both Application Priority Indicators (or giving them both a value of 0000) and assigning the “Mastercard” payment application a lower order (placing it first in the PPSE); or a combination thereof. In such a case:

-   -   Only one compatible payment application is found—“American         Express”     -   The Candidate List only has one entry—“American Express”     -   Entry Point 150 selects this combination using the SELECT         (“American Express”) 166, activating the associated kernel 170,         and using the kernel 180 to further process the payment         transaction using the “American Express” payment application or         second payment application.

This occurs automatically in this case, and may be inconvenient for the User 130 who does not realise that the lower priority payment application has been used for the payment transaction.

Problem 3): The ID devices 120 may have a PPSE comprising two payment applications from the same issuer. In this case, the payment applications include a priority indication.

For example, a first payment application in the PPSE is “Mastercard #business” and a second is “Mastercard #personal”, and the POI terminal 110 is compatible with “Mastercard”. In this case, the PPSE is programmed to provide the second payment application “Mastercard #personal” with a higher priority than “Mastercard #business”—by, for example, the “Mastercard #personal” Directory Entry comprising an Application Priority Indicator of 1 and the “Mastercard #business” Directory Entry comprising an Application Priority Indicator of greater than 1; or by assigning the same Application Priority Indicator to both payment applications and assigning the “Mastercard #personal” payment application a lower order (placing it first in the PPSE); or by not assigning both Application Priority Indicators (or giving them both a value of 0000) and assigning the “Mastercard #personal” payment application a lower order (placing it first in the PPSE); or a combination thereof. In this case:

-   -   Two compatible payment applications are found—“Mastercard         #personal” and “Mastercard #business”     -   The Candidate List has two entries—“Mastercard #personal” and         “Mastercard #business”     -   Entry Point 150 selects the highest priority combination using         the SELECT (“Mastercard #personal”) 166, activating the         associated kernel 170, and using the kernel 180 to further         process the payment transaction using the “Mastercard #personal”         payment application or second payment application.

This occurs automatically in this case, and may be inconvenient for the User 130 who does not realise which of the payment applications was used for the payment transaction.

FIG. 2 depicts an improved payment transaction 200. The POI terminal 110 is provided as described above in relation to FIG.1 and FIG. 3, and similarly programmed to interact in accordance with the standard EMV Contactless payment transaction specifications and protocols. Also, the POI terminal 110 may be comprised in a POS terminal 112 with an optional POI display 115.

The consumer 130 wishing to make a payment transaction may carry an improved contactless ID device 220—this improved device supports conventional transactions 100 in accordance with the standard EMV Contactless specifications and protocols as described herein in relation to FIG.1 and FIG. 3, FIGS. 5A and 5B

In addition, the improved contactless ID device 200 comprises functionalities to support improved payment transactions 200 which are not described in the EMV specifications and protocols. However, the improved payment transactions 200 are configured to be performed with POI terminals 110 that comply fully with the current EMV specifications and protocols. In other words, by utilizing mechanisms present in the EMV specifications and protocols in novel and non-obvious ways, the improved contactless ID device 220 provides the User 130 with a higher degree of control over the payment applications used to complete payment transactions 200.

“Contactless” refers to the communication channels 140 used for the interaction—no electrical contact is required for this communication. However, contact for other purposes, such as physical contact (for example, tapping or holding the improved ID device 220 against part of the POI terminal 110) is not excluded by the word “contactless”. Similarly, tapping or contacting the improved ID device 220, such as on a touch-screen or user interface 230, is not excluded by “contactless”. Electrical connections may even be provided, for example, as a power supply for an improved contactless ID device 220 with suitable power connections to support “contactless” communication.

The improved contactless ID devices 220 may also be comprised, for example, in an integrated circuit, a bio-sensor, a medical implant, a contacted card, a portable electronic device, a SIM module, a mobile computer, a remote server, or any combination thereof. An improved ID device 220 may be wholly or partially virtual. It may also be a combination of software and/or hardware comprised in a suitably configured improved mobile device 224.

The improved ID device 220 further comprises a user interface 230, configured and arranged to allow the User 130 to provide one or more inputs. For example, the improved ID device 220 may be:

-   -   An improved mobile device 224 comprising the improved ID device         220 functionality and a user interface 230     -   An improved contactless chipcard 222 comprising the improved ID         device 220 functionality and a user interface 230     -   An improved contactless chipcard 222 comprising the improved ID         device 220 functionality and an improved mobile device 224         comprising a user interface 230. The improved mobile device 224         is further provided with appropriate software and/or hardware to         interact with the improved contactless chipcard 222.     -   An improved contactless chipcard 222 comprising the improved ID         device 220 functionality. A user interface 230 may be comprised         in an improved POI terminal (not shown). The improved POI         terminal is further provided with appropriate software and/or         hardware to interact with the improved contactless chipcard 222.

Note that the EMV specifications and protocols are directed to providing standardized interactions between a contactless ID device 120, 220 and a POI terminal 110 for creating a high degree of worldwide interoperability. In general, issuers of payment applications, contactless cards and virtual contactless cards have a high degree of freedom to determine the functionality and form of any user interface 230.

In accordance with the invention, a simple user interface 230 may be provided, such as:

-   -   a menu, displayed on the touch screen of an improved mobile         device 224, allowing a desired payment application to be         directly selected by touching the entry in the menu     -   two of more physical buttons on an improved contactless card         222, allowing the User 130 to press one of the buttons to         directly select a desired payment application. Similarly, some         other form of touch detection, such as conductivity measurement,         may also be used.     -   an orientation sensor comprised in an improved contactless card         222 or an improved mobile device 224, allowing a desired payment         application to be directly selected by holding the card 222 or         device 224 in a particular orientation     -   an impact sensor comprised in an improved contactless card 222         or an improved mobile device 224, allowing a desired payment         application to be directly selected by “tapping” the card 222 or         device 224

As it may be advantageous to provide a user interface configured to select between only a few options, or even between two, a visual display of the options is not essential.

In addition, issuers of payment applications, contactless cards and virtual contactless cards have a high degree of freedom to determine the functionality and form of the hardware and software used for the improved ID device 220 in regard to aspects not directly related to the EMV-compliant contactless transactions.

FIG. 4 depicts the use of the same High Level Architecture of Entry Point 150 as depicted in FIG. 3, as part of the improved payment transaction 200. For clarity, only a portion of the High Level Architecture is depicted.

The first part of the improved payment transaction 200 is the same as described above in reference to FIG. 3. After Pre-Processing 155 and Protocol Activation 157, Combination Selection 160 is carried out:

-   -   Entry Point 150 sends a SELECT (PPSE) command 162 to the         improved ID device 220     -   The first File Control Information (FCI) 164 response is         provided by the improved ID device 220. It contains parameters,         including the one or more Directory Entries from the PPSE,         associated with one or more payment applications     -   The POI terminal 110 determines, using Entry Point 150, the         compatibility of the payment applications for participating in         the EMV-compliant payment transaction with the POI terminal 110         in the same way as described above in relation to FIG. 3     -   The POI terminal 110 selects one of the one or more payment         applications as preferred to continue the improved payment         transaction 200 using the compatibilities and the parameters in         the same way as described above in relation to FIG. 3.     -   The POI terminal 110 communicates the POI-selected payment         application to the improved ID device 220 by sending a SELECT         (AID) command 166.     -   A second File Control Information (FCI) response 175 from the         improved ID device 220 is sent—this is received and processed by         Entry Point 150, including status bytes SW1 SW2 in the same way         as described above in relation to FIG. 3.     -   The associated kernel 170 is activated in the same way as         described above in relation to FIG. 3.     -   The improved ID device 220 distinguishes itself from the         conventional ID device 120 by comprising hardware and/or         software configured and arranged:         -   to provide a user-configurable EMV-compliant response 194             which restarts 152 the improved payment transaction 200; and         -   to receive using the user interface 230 a selection of one             of the one or more payment applications. This is the             User-selected payment application. Alternatively or             additionally, the user interface 230 may be further             configured to prompt the User 130 to make the selection.     -   This allows the user, for example, to be notified of the payment         transaction to be used (the POI-selected payment application),         to confirm the payment application to be used and/or to change         the payment application to the User-selected payment application         by modifying the PPSE and restarting 194, 152 the improved         payment transaction 200.     -   User-configurable EMV-compliant responses 194 which restart 152         the improved payment transaction 200 are those responses which         result in the Protocol Activation 157 being restarted using a         Start B 152. This restart avoids having to carry out         Pre-Processing 155 which is considered the initiation of a new         payment transaction, requiring in most cases the amount and         currency to be specified by the merchant. It may also require         communication between the POI terminal and the ID device be         renegotiated. Avoiding Pre-Processing 144 and payment         transaction termination is quicker and more convenient for both         the merchant and the user.     -   For example, providing a response such that the kernel 180         generates a Try Again Outcome 194. As described in EMV         Contactless, Book A, Appendix B—on completion, a kernel 180         indicates its results by means of an Outcome 192, 194, 196 and         provides parameter values suited to the associated Outcome 192,         194, 196 and to the acceptance environment (EMV mode or         mag-stripe mode).     -   EMV book A, Annex B.8 indicates that in the case of Try Again         194, the kernel 180 determines that the payment transaction         should be attempted for a second time. This may also be         described as prompting for a second tap to retry the         transaction. Traditionally, this is used to allow entry of a         Confirmation Code (for example, a PIN code) into a mobile         device, and the field is turned off for 1300ms. In the improved         payment transaction 200, it may also be used to allow entry of a         Confirmation Code. The Try Again Outcome 194 is processed using         Outcome Processing 190 such that Protocol Activation 157 is         started via Start B 152.

Try Again 194 parameters (selection)

-   -   Start: B     -   UI Request on Outcome Present: Yes         -   Message Identifier: ‘20’ (“See Phone for Instructions”)         -   Status: Processing Error         -   Hold Time: 13         -   Language Preference: ‘en’     -   UI Request on Restart Present: Yes         -   Status: Ready to Read     -   Data Record Present: No     -   Discretionary Data Present: Yes or No     -   Field Off Request: 13     -   Removal Timeout: zero

The Try Again Outcome 194 may be triggered during Kernel Processing 180 by any convenient means. The details of Kernel Processing 180 may be configured and arranged by an issuer to support payment-system specific interactions and transactions

For example, as defined in Kernel 2 Specification Book C-2, Annex A.1.124, a data object may be provided to inform the Kernel about the indicators set in the improved Mobile Device 224 that may influence the action flow. In this case, it is called “POS Cardholder Interaction Information” (POSCII). As explained in section 3.8.2, when returned by the Card, the POS Cardholder Interaction Information indicates whether:

-   -   An ACK is required, such as a button push     -   On-device cardholder verification (OD-CVM) is required (e.g. PIN         entry)—this may be considered as a Confirmation Code;     -   On-device cardholder verification (OD-CVM) has been completed         successfully;     -   The context is conflicting, meaning the cardholder device         detected a discrepancy between the data used for a first tap and         the data used for a second tap, the first and second tap being         both part of the same transaction 200;     -   The application is activated, and if not, how to remedy this and         activate the application;     -   The limits are exceeded or not;     -   A payment application or wallet requires a second tap;

The Try Again Outcome 194 is preferably utilized in the improved payment transaction 200 to prompt for a second tap during Kernel Processing 180 based on POSCII in situations where a user action is required: ACK is required or OD-CVM is required.

The Kernel checks the Amount, Authorized (Numeric) against the Reader Contactless Transaction Limit and returns an OUT Signal if the transaction amount is greater than this limit. The OUT Signal includes a Status value of Select Next, to request that the next AID from the candidate list should be selected.

The Kernel then checks whether the transaction amount exceeds the Reader CVM Required Limit and, if so, updates the Mobile Support Indicator accordingly.

Section .8.3 and 5.2.3 of Book C-2 provide more details of this example—the improved ID device 220 may be configured to return an AAC (Authentication Application Cryptogram) in response to a “GENERATE AC” command. The AAC may be accompanied by the additional data object POSCII to indicate that “CDCVM Required” or “Consent Required” or more generally “Restart Required”.

Book C-2 included the following examples of states that results in a Start B 152 Try Again outcome:

-   -   State 3 (S3)—Waiting for GPO Response—in sections 6.5.2 Flow         Diagram and 6.5.3 Processing—S3.5     -   State R1 (SR1)—Waiting for Exchange Relay Resistance Data         Response—in sections 6.6.2 Flow Diagram and 6.6.3         Processing—SR1.5.2     -   State 4 (S4)—Waiting for EMV Read Record Response—in sections         6.8.2 Flow Diagram and 6.8.3 Processing—S4.6     -   State 5 (S5)—Waiting for Get Data Response in sections 6.10.2         Flow Diagram and 6.10.3 Processing—S5.6     -   State 7 (S7)—Waiting for Mag-stripe Read Record in sections         6.13.2 Flow Diagram and 6.13.3 Processing—S7.6     -   State 9 (S9)—Waiting for Generate AC Response—1 in sections         6.16.2 Flow Diagram and 6.16.3 Processing—S9.10 & S9.15     -   State 10 (S10)—Waiting for Recover AC Response in sections         6.17.2 Flow Diagram and 6.17.3 Processing—S10.6     -   State 11 (S11)—Waiting for Generate AC Response—2 in sections         6.19.2 Flow Diagram and 6.19.3 Processing—S11.17     -   State 12 (S12)—Waiting for Put Data Response Before Generate         AC—in sections 6.20.2 Flow Diagram and 6.20.3 Processing—S12.6     -   State 13 (S13)—Waiting for CCC Response—1 in sections 6.21.2         Flow Diagram and 6.21.3 Processing—S13.5     -   State 14 (S14)—Waiting for CCC Response—2 in sections 6.22.2         Flow Diagram and 6.22.3 Processing—S14.5.

Note that “Try Again” is used in different contexts in the EMV specifications and protocols. However, the states that are relevant to this invention are the ones that result in the same payment transaction being restarted, and not those that result in a new payment transaction to be initiated.

The Kernel decision in this example restarts the same payment transaction using the POSCII data object to indicate that the User 130 should address an issue on the improved ID device 220 and present the contactless device 220 again. The status of the transaction outcome is defined as “END APPLICATION” and a UI message may be generated such as “See Phone For Instructions”.

In a second example, providing a response such that the kernel 180 generates an End Application (with restart) Outcome 194. EMV book A, Annex B.11 indicates that in the case of End Application (with restart) Outcome 194, the kernel 180 requires a restart after confirmation of card removal. The End Application (with restart) Outcome 194 is processed using Outcome Processing 190 such that Protocol Activation 157 is started via Start B 152.

End Application (with restart) 194 parameters (selection)

-   -   Start: B     -   UI Request on Outcome Present: Yes         -   Message Identifier: ‘21’ (“Present Card Again”)         -   Status: Not Ready         -   Hold time 13     -   UI Request on Restart Present: Yes         -   Message Identifier: ‘21’ (“Present Card Again”)         -   Status: Ready to Read     -   Data Record Present: No     -   Discretionary Data Present: Yes or No     -   Field Off Request: Optional     -   Removal Timeout: zero

The End Application (with restart) Outcome 194 may be triggered during Kernel Processing 180 by any convenient means. The details of Kernel Processing 180 may be configured and arranged by an issuer to support payment-system specific interactions and transactions. States similar to those described above for the Try Again Outcome 194 may be used.

-   -   Note that the End Application Outcome 196, as described in EMV         Book A, Annex B.10 is not the same as End Application (with         restart) 194—End Application Outcome 196 is a final Outcome 196         which signals an unrecoverable error and terminates the current         payment transaction.

In a third example, providing a response such that the kernel 180 generates a communications error.

-   -   The communications error may be triggered during Kernel         Processing 180 by any convenient means. The details of Kernel         Processing 180 may be configured and arranged by an issuer to         support payment-system specific interactions and transactions.         Any configuration generating, for example, a “time-out” may be         used:     -   For example, as described in Section 3.10 of Book C-2, if the         timings determined by the POI terminal 110 exceed the maximum         limit computed, a communication error may be generated when the         Relay Resistance Protocol is supported by the improved ID device         220 and the protocol is invoked by the POI terminal 110.

In the examples above, the EMV-compliant response is provided by the improved ID device 220 during Kernel Processing 180. Alternatively or additionally, a suitable EMV-compliant response 194 may be provided during Combination Selection 160 and/or Kernel Activation 170. However, due to restrictions imposed by the EMV specifications and protocols, it may be advantageous to configure the response to be generated only during Kernel Processing 180.

Although depicted in FIG. 4 as occurring during Kernel Processing 180, prompting 260 of the user 130 to select either the one of the payment applications may be carried out at any convenient point during the improved payment transaction 200. For example, during Combination Selection 160 after the improved ID device 220 receives the SELECT(AID) command 166 indicating the POI-selected payment application.

The improved ID device 220 may determine that a situation has occurred, that requires User input 260. The improved ID device may, for example:

-   -   prompt 260 the user 130 after receiving the POI-selected payment         application. If applicable, modify the PPSE and immediately         restart 152 the improved payment transaction 200 by providing         the appropriate EMV-compatible response 284 instead of the         second FCI response 175.     -   prompt 260 the user 130 after receiving the POI-selected payment         application. Provide the standard second FCI response 175 to         activate the kernel 180 associated with the POI-selected payment         application. During Kernel Processing 180, modify the PPSE and         immediately restart 152 the improved payment transaction 200 by         providing the appropriate EMV-compatible response 284 instead of         a standard Response APDU's (R-APDU) 184.

The improved ID device 220 may be programmed to operate in many different ways in interactions with EMV-compliant POI terminals 110. The User 130 may configure more extensively the use of the improved ID device 220.

The invention reduces problem 1) by allowing the User 130 to include more than one payment application in the PPSE. The invention provides a higher degree of control, so the chance that a User 130 is surprised by either a payment transaction 200 using an unexpected payment application, or surprised by a payment transaction being declined, is greatly reduced. The invention provides a recovery mechanism to allow a second or further payment application to be used in case of mismatches between the capabilities of a POI terminal 110 and the available payment applications.

Situations in which the user may wish to be prompted 260 for input may include:

1) Always—particular for users 130 with a plurality of available payment applications, it may be advantageous to always display on a suitable configured user interface 230 the POI-selected payment application.

The user may then provide inputs 260 to the improved ID device 220 that:

-   -   a different payment application be used (User-selected payment         application). The improved ID device 220 then modifies the PPSE         and restarts 152 the improved payment transaction 200. This may         be a payment application already present in the PP SE, or an         additional software application may be used to add a new payment         application. The PPSE is modified using the order of entries in         the PPSE and/or the Application Priority Indicator such that the         Combination Selection 160 chooses the User-selected payment         application as the POI-selected payment application.         Alternatively, the PPSE may be modified to only include a single         entry representing the User-selected payment application.     -   use of the POI-selected payment application is confirmed. The         improved ID device 220 provides the conventional responses,         allowing the improved payment transaction 200 to continue     -   the current improved payment transaction be terminated or         declined.

2) If the POI-selected payment application is not the one indicated in the PPSE as the highest priority. This addresses Problem 2) and Problem 3) described above.

The User 130 provided input before initiating the improved payment transaction 200 that one of their payment applications should have the highest priority. This is typically done when setting up the improved ID device 220, or when adding a further payment application. The improved ID device 220 typically stores these preferences using the order of entries in the PPSE and/or the Application Priority Indicator.

The improved ID device 220 may be configured to prompt the user 260 is the POI-selected payment application is not the same as the payment application with the highest priority. As mentioned in Problem 2), this may occur when the highest priority payment application is not compatible with the POI terminal 110.

The user 130 is prompted with the POI-selected payment application, and an indication that this is not the current highest priority payment application in the PPSE.

The user 130 then provide inputs 260 to the improved ID device 220 that:

-   -   a different payment application be used (User-selected payment         application). The improved ID device 220 then modifies the PPSE         and restarts 152 the improved payment transaction 200 as         explained for the “Always” example.     -   use of the POI-selected payment application is confirmed. The         improved ID device 220 provides the conventional responses,         allowing the improved payment transaction 200 to continue.     -   the current improved payment transaction be terminated or         declined.

The improved ID device 220 may allow the PPSE to be modified for a number of improved payment transactions, or it may be modified for only the current improved payment transaction. The Improved ID device 220 may further comprise memory to store one or more PPSE configurations. Additionally or alternatively, a suitably configured mobile device 224 may be used to store one or more PPSE configurations, and to reprogram the PPSE as required.

The PPSE may be modified using the order of entries in the PPSE and/or the Application Priority Indicator such that the Combination Selection 160 chooses the User-selected payment application as the POI-selected payment application. Alternatively, the PPSE may be modified to only include a single entry representing the User-selected payment application. Additionally or alternatively, one or more undesired payment applications may be deleted from the PPSE.

When using an improved mobile device 224 to participate in improved payment transaction 200, the number of taps required for payment may also be reduced by configuring and arranging the responses of the mobile device 224 during Kernel Processing 180. For example, a second tap may be required in the standard execution to allow the User 130 to be authenticated—implementing the invention as described above may lead to the requirement of three or more taps to complete the payment transaction 200.

Additionally or alternatively, the improved mobile device 224 may be further configured to require User authentication during the same interruption used to allow a different payment application to be selected. This may reduce the number of taps required to complete the improved payment transaction 200. The indication that an authentication is required may be made dependent on other parameters, such as the amount of the transaction. The PPSE may be modified as described to determine the priority of applications. The undesired payment application(s) may be additionally or alternatively removed from the PPSE. Advantageously, the PPSE modification is performed before the second tap, reducing the number of taps to two.

If authentication has been performed and there is no need for a further user authentication, the improved mobile device 224 may be configured to return, for example, an ARQC (Authorization ReQuest Cryptogram) that may be used to generate an authorization to the issuer, or it may decline the transaction by returning an AAC with a POSCII to indicate that CDCVM is required.

FIG. 5A depicts the use of the same High Level Architecture of Entry Point 150 as depicted in FIG. 3, as part of the improved payment transaction 200. For clarity, only a portion of the High Level Architecture is depicted. While FIG. 5A is described in the context of a payment application and EMV-compliant messaging, it will be understood that the principles of this invention can be equally well implemented in the context of a framework other than EMV and/or in the context of a transaction that does not have the taking of a payment as an objective. The first part of the improved payment transaction 200 is the same as described above in reference to FIG. 3. After Pre-Processing 155 and Protocol Activation 157, Combination Selection 160 is carried out:

-   -   Entry Point 150 sends a SELECT (PPSE) command 162 to the         improved ID device 220     -   The first File Control Information (FCI) 164 response is         provided by the improved ID device 220. The FCI response         includes an application list that is part of the environment         (e.g. PPSE), where the application list contains parameters,         including the one or more Directory Entries from the PPSE,         associated with a first payment application and optionally a         second payment application.     -   In one particular implementation the application list can         include only the parameters associated with the first payment         application. In another implementation, the application list can         include first application parameters associated with the first         payment application and second application parameters associated         with a second, different payment application. In this case, the         application list also includes a first application priority         value and a second application priority value, each associated         with the respective payment application. The application         priority values are used to rank the applications in order of         priority, on the understanding that a payment application having         a higher priority value will be used in preference over a         payment application having a lower priority value. Reference is         made here to the discussion earlier in this specification         relating to the PPSE, payment applications, Candidate Lists and         Application Priority Indicators.     -   It will be appreciated that any number of further application         parameters, e.g. third, fourth, fifth, etc. application         parameters, that are associated with respective further         applications, can optionally also be included in the application         list. Each further application also has a corresponding priority         value.     -   The POI terminal 110 determines, using Entry Point 150, the         compatibility of the payment application(s) associated with the         parameters included on application list for participating in the         EMV-compliant payment transaction with the POI terminal 110 in         the same way as described above in relation to FIG. 3     -   The POI terminal 110 selects one of the one or more payment         applications as preferred to continue the improved payment         transaction 200 using the compatibilities and the parameters in         the same way as described above in relation to FIG. 3. In the         case where there the application list includes only the         parameters associated with the first application, such that         there is no set of applications to choose from, this step simply         selects the first application.     -   The POI terminal 110 communicates the POI-selected payment         application to the improved ID device 220 by sending a SELECT         (AID) command 166.     -   A second File Control Information (FCI) response 175 from the         improved ID device 220 is sent—this is received and processed by         Entry Point 150, including status bytes SW1 SW2 in the same way         as described above in relation to FIG. 3.     -   The associated kernel 170 is activated in the same way as         described above in relation to FIG. 3.     -   The improved ID device 220 distinguishes itself from the         conventional ID device 120 by comprising hardware and/or         software configured and arranged:     -   responsive to a confirmation request (182) from the POI terminal         110 that a first payment application should be used to effect         payment, applying one or more rules to data contained within the         confirmation request and determining that a second payment         application is to be used instead of the first payment         application;     -   transmitting to the POI terminal 110 an EMV-compatible response         284 which restarts 152 the improved payment transaction 200;     -   causing a communication channel between the POI terminal 110 and         the improved ID device 220 to be broken, and subsequently         causing a communication channel to be established between the         POI terminal 110 and the improved ID device 220.

In this case this is achieved by displaying a message 500 on the user interface 230 of the improved ID device 220, the message instructing the user to remove improved ID device 220 from the field generated by POI terminal 110 so as to break the communication channel and subsequently move the improved ID device 220 into the field generated by the POI terminal 110 so as to establish the communication channel;

-   -   modifying (not shown) a PPSE environment so as to cause the         second payment application to be used in the payment transaction         going forward; and     -   transmitting an EMV-compatible message 505 to the POI terminal         110, the EMV-compatible message based on the modified PPSE         environment, so as to cause the transaction to proceed using the         second payment application.

As discussed above, the modifying of the PPSE environment can include removing at least one first payment application parameter from the payment application list and replacing it with at least one second payment application parameter. Alternatively, the first payment application priority value and/or the second payment application priority value can be adjusted such that the priority of the second payment application is higher than the priority of the first payment application.

FIG. 5B depicts the use of the same High Level Architecture of Entry Point 150 as depicted in FIG. 3, as part of the improved payment transaction 200. For clarity, only a portion of the High Level Architecture is depicted. FIG. 5B is an alternative configuration to the configuration of FIG. 5A. Both configurations may achieve the effect of enabling a payment application to be changed during a transaction without significant user disruption.

While FIG. 5B is described in the context of a payment application and EMV-compliant messaging, it will be understood that the principles of this invention can be equally well implemented in the context of a framework other than EMV and/or in the context of a transaction that does not have the taking of a payment as an objective.

The first part of the improved payment transaction 200 is the same as described above in reference to FIG. 3. After Pre-Processing 155 and Protocol Activation 157, Combination Selection 160 is carried out:

-   -   Entry Point 150 sends a SELECT (PPSE) command 162 to the         improved ID device 220     -   The first File Control Information (FCI) 164 response is         provided by the improved ID device 220. The FCI response         includes a payment application list that is part of the PP SE,         where the payment application list contains parameters,         including the one or more Directory Entries from the PPSE,         associated with a first payment application and optionally a         second payment application.     -   In one particular implementation the payment application list         can include only the parameters associated with the first         payment application. In another implementation, the payment         application list can include first payment application         parameters associated with the first payment application and         second payment application parameters associated with a second,         different payment application. In this case, the payment         application list also includes a first payment application         priority value and a second payment application priority value,         each associated with the respective payment application. The         payment application priority values are used to rank the payment         applications in order of priority, on the understanding that a         payment application having a higher priority value will be used         in preference over a payment application having a lower priority         value. Reference is made here to the discussion earlier in this         specification relating to the PPSE, payment applications,         Candidate Lists and Application Priority Indicators.     -   It will be appreciated that any number of further payment         application parameters, e.g. third, fourth, fifth, etc. payment         application parameters, that are associated with respective         payment applications, can optionally also be included in the         payment application list. Each further payment application also         has a corresponding priority value.     -   The POI terminal 110 determines, using Entry Point 150, the         compatibility of the payment application(s) associated with the         parameters included on payment application list for         participating in the EMV-compliant payment transaction with the         POI terminal 110 in the same way as described above in relation         to FIG. 3     -   The POI terminal 110 selects one of the one or more payment         applications as preferred to continue the improved payment         transaction 200 using the compatibilities and the parameters in         the same way as described above in relation to FIG. 3. In the         case where there the payment application list includes only the         parameters associated with the first payment application, such         that there is no set of payment applications to choose from,         this step simply selects the first payment application.     -   The POI terminal 110 communicates the POI-selected payment         application to the improved ID device 220 by sending a SELECT         (AID) command 166.     -   A second File Control Information (FCI) response 175 from the         improved ID device 220 is sent—this is received and processed by         Entry Point 150, including status bytes SW1 SW2 in the same way         as described above in relation to FIG. 3.     -   The associated kernel 170 is activated in the same way as         described above in relation to FIG. 3.     -   The improved ID device 220 distinguishes itself from the         conventional ID device 120 by comprising hardware and/or         software configured and arranged:     -   responsive to a confirmation request (182) from the POI terminal         110 that a first payment application should be used to effect         payment, applying one or more rules to data contained within the         confirmation request and determining that a second payment         application is to be used instead of the first payment         application;     -   transmitting to the POI terminal 110 an EMV-compatible response         284 which restarts 152 the improved payment transaction 200;     -   causing (500) a communication channel between the POI terminal         110 and the improved ID device 220 to be broken, and         subsequently causing a communication channel to be established         between the POI terminal 110 and the improved ID device 220,         where in the case of FIG. 5B this is achieved by an antenna 510         of the improved ID device 220 being is turned off 515 and turned         back on again 520 after a predetermined time has elapsed;     -   modifying (not shown) a PPSE environment so as to cause the         second payment application to be used in the payment transaction         going forward; and     -   transmitting an EMV-compatible message 505 to the POI terminal         110, the EMV-compatible message based on the modified PPSE         environment, so as to cause the transaction to proceed using the         second payment application.

As discussed above, the modifying of the PPSE environment can include removing at least one first payment application parameter from the payment application list and replacing it with at least one second payment application parameter.

Alternatively, the first payment application priority value and/or the second payment application priority value can be adjusted such that the priority of the second payment application is higher than the priority of the first payment application.

The following discussion is applicable to both FIGS. 5A and 5B:

The EMV-compatible response 284 may take the form of a Try Again Outcome 194 as described earlier. The Try Again Outcome 194 means that the POI terminal 110 retains information pertinent to the transaction, e.g. the transaction amount, when the transaction is restarted. Reference is made here to Protocol Activation 157 being restarted using a Start B 152 as discussed earlier in this specification.

The one or more rules may be programmatically defined and stored in a storage medium that is accessible to improved ID device 220. Improved ID device 220 has access to a set of payment applications comprising at least the first payment application and the second payment application. The one or more rules define one or more tests for determining whether a first payment application that the POI terminal 110 is requesting be used to complete a transaction is the most appropriate payment application of the set of payment applications for completing the transaction. The rules themselves will be defined according to the specifics of the scenario at hand and a person skilled in the art having the benefit of the present disclosure will be able to devise appropriate rules for a given situation. Exemplary rules are discussed later in this specification in connection with the first, second third and fourth use cases.

The one or more additional actions may comprise presenting, to the User 130, a user-intelligible instruction to remove the improved ID device 220 from the field generated by the POI terminal 110 after the EMV-compatible response 194 that restarts 152 the improved payment transaction 200 has been transmitted. The user-intelligible instruction may further specify that the User 130 should return the improved ID device 220 into the field of the POI terminal 110 after removal. The user-intelligible instruction may be displayed on a display of the improved ID device 220, perhaps in the form of user-readable text and/or one or more images forming part of user interface 230 and/or an app notification as is known in the art per se.

The user-intelligible instruction does not require the User 130 to input any information into improved ID device 220 regarding the selection of a replacement payment application; all that is necessary is that the User 130 follow the instruction, e.g. move the improved ID device 220 out of the range of the field emitted by POI terminal 110 and subsequently return the improved ID device 220 back into range of the field emitted by POI terminal 110. The user-intelligible instruction should thus be understood as distinct from a prompt or request for user input regarding selection of a payment application, which prompt or request requires the user to provide some form of input to select a payment application, e.g. selecting a payment application by touching an appropriate portion of a menu provided on a touchscreen.

The user interface can comprise text and/or image(s) that instruct the User 130 to remove the improved ID device 220 from the field emitted by POI terminal 110 and subsequently return the improved ID device 220 to be located within the field emitted by POI terminal 110. Such a user interface need not be configured to accept input from the User 130 to select a replacement payment application, and instead can in some cases simply provide information or instructions for the User 130 to act upon. The user interface may take the form of text and/or one or more images forming part or all of user interface 230. Other formats such as an app notification as is known per se in the context of mobile device operating systems, e.g. an Android™ Notification or an iOS® Notification, are also contemplated.

Optionally, the user interface can include a mechanism for enabling the User 130 to approve or reject the replacement of the first payment application by the second payment application as suggested by the improved ID device 220. The mechanism can be any human interface element that enables the User 130 to indicate whether they approve or reject the replacement of the first payment application with the second payment application. Examples include: an on-screen menu including selectable ‘accept’ and ‘reject’ buttons, an instruction for the User 130 to perform a particular gesture to indicate approval/rejection such as ‘swipe left to approve, swipe right to decline’, an instruction for the User 130 to interact with the improved ID device 220 in a specific manner such as ‘press button X to approve or button Y to reject’, and the like.

In the case where the user interface includes a User 130 approve/reject mechanism, improved ID device 220 is configured such that it does not update the application list until it has received approval from User 130 to replace the first payment application with the second payment application. In cases where the antenna is being turned off and then on, improved ID device 220 may defer turning off the antenna until approval has been provided by the User 130.

Improved ID device 220 can determine that it has been removed from the field generated by POI terminal 110 by a break in a communication channel previously established between an antenna of the improved ID device 220 and a correspondingly configured antenna of the POI terminal 110. Here, ‘break’ is understood to mean that the channel is unavailable for any form of signaling. ‘Antenna’ refers to the component or components that the improved ID device 220 makes use of to communicate with POI terminal 110, e.g. a NFC antenna or a Bluetooth antenna.

Similarly, improved ID device 220 can determine that it has been returned to the field generated by the POI terminal 110 by the establishment of a communication channel between the POI terminal 110 and the improved device 220. Here, an established communication channel is a communication channel that is available for signaling.

Improved ID device 220 can be configured to detect the breaking and subsequent establishing of a communication channel with POI terminal 110 and to use this sequence of events as an indication that the user-intelligible instruction has been correctly followed. Establishment of the communication channel with the POI terminal 110 can be used as a trigger to continue with the transaction, and specifically may be used as a trigger for transmitting modified payment application parameters to initiate a second payment attempt. Modification of payment application parameters is discussed below in more detail.

The one or more additional actions may alternatively comprise, after transmitting the EMV-compatible response 194 that restarts 152 the improved payment transaction 200, turning the antenna of the improved ID device 220 off, and then turning it back on again after a predetermined time has elapsed. The predetermined time is selected such that, from the perspective of the POI terminal 110, the improved ID device 220 appears to have been removed from the field generated by the terminal and subsequently returned to this field. The predetermined time may be, for example, approximately 1 second; however, the invention is not limited in this respect and other values for the predetermined time can alternatively be used.

Turning the antenna off in this specification is understood to mean that the antenna is not capable of either active or passive communication with another device having a compatible antenna. This is synonymously referred to as disabling the antenna. Turning off or disabling the antenna thus has the effect of breaking any communication channel established between POI terminal 110 and the improved ID device 220, so as to render the improved ID device 220 undetectable by POI terminal 110. Turning on the antenna, or synonymously enabling the antenna, is understood to have the reverse effect; i.e. rendering the improved ID device 220 capable of active and/or passive communication with another device having a compatible antenna, i.e. establishing a communication channel between the POI terminal 110 and the improved ID device 220. Turning on or enabling the antenna thus has the effect of rendering the improved device 220 detectable by POI terminal 110.

Responsive to the turning off and on of the antenna, or to display of the user-intelligible instructions to remove the improved ID device 220 from the field and returning it into the field, the improved ID device 220 can modify the PPSE environment so as to cause the transaction to proceed using the second payment application.

Modification can take the form of modifying the payment application list to generate a modified payment application list. As discussed earlier, in the case where the payment application list comprises at least one first payment application parameter only, the at least one first payment application parameter can be removed from the payment application list and replaced with at least one second payment application parameter.

Alternatively, the payment application list can include at least one first payment application parameter and at least one second payment application parameter. In this case the payment application list also includes a first payment application priority value associated with the first payment application and a second payment application priority value associated with the second payment application. The priority of a payment application governs whether it is used in a transaction, with a higher priority payment application being used in preference to a lower priority payment application.

The priority value assigned to a payment application can take the form of an Application Priority Indicator. A payment application can have a priority that ranks it at the top of the payment application set, e.g. an Application Priority Indicator of 1. If multiple payment applications have been assigned the same priority, ranking may be decided using the further parameter of application order within the PPSE. Specifically, the payment application having the lowest order in the PPSE may be selected in the event that multiple payment applications have the same Application Priority Indicator. Reference is made here to the discussion earlier in this specification relating to the PPSE, payment applications, Candidate Lists and Application Priority Indicators.

It will be appreciated that modifying the PPSE environment to elevate the second payment application to top priority will cause the second payment application to be used in the transaction going forward, i.e. from the point at which the transaction was restarted. This, combined with the removal and subsequent replacement of the improved ID device 220 from the field generated by the POI terminal 110, or the powering off and on of the antenna of the improved ID device 220, causes POI terminal 110 to use the second payment application to complete the restarted transaction, in place of the first payment application that was initially involved in the transaction.

It will also be appreciated that it is possible to elevate a payment application to the top priority of the payment application set by lowering the priority of one or more of the other payment applications in the set. Such an action is also within the scope of the activity of ‘elevating a payment application to top priority’.

After the modification of the PPSE to generate the modified payment application list, the improved ID device 220 transmits the modified payment application list to the POI terminal 110. It will be understood that, as a result of the modifying, either the at least one first payment application parameter has been replaced with the at least one second payment application parameter, or the priority value of the second payment application has been set as higher than the priority value of the first payment application. In both cases, the second payment application will be used in the transaction going forward.

At this point, the POI terminal 110 has restarted the transaction in accordance with the EMV-compatible request for restarting the transaction that was previously transmitted to the POI terminal 110 by the improved ID device 220. Thus, on receipt of the modified payment application list, the POI terminal 110 proceeds with the transaction using the second payment application.

As part of proceeding with the transaction, POI terminal 110 generates a second EMV-compatible request for confirmation that the transaction should proceed, this time using the second payment application rather than the first payment application. The second EMV-compatible request is transmitted to the improved ID device 220 and is received by the improved ID device 220.

Improved ID device 220 processes the second EMV-compatible request in the same manner as the first EMV-compatible request. However, in this case no determination is made that another payment application should be used instead of the second payment application to complete the transaction, because the one or more rules already specify that the second payment application is the optimal payment application to use in this instance. Therefore, improved ID device 220 operates to transmit a response to the second EMV-compatible request to the POI terminal 110. The response can take the form of an approval, a denial, or other response forms as are known in the art. The transaction is then completed by the POI terminal 110 according to the response provided by the improved ID device 220.

Advantageously, the process described above in connection with FIG. 5 enables the switching from a default or initial payment application to a preferred payment application in a manner that is user friendly. The User 130 is not required to enter additional information or otherwise interact with improved ID device 220 to make a selection of the preferred payment application, resulting in an improved user experience. Instead, this selection is performed automatically by the improved ID device 220 by applying the one or more rules to information received from the POI terminal 110 in the EMV-compatible request for confirmation that the transaction should be completed.

The switching to a preferred payment application is particularly user friendly in the case where the antenna of the improved ID device 220 is turned off and then turned on, as in this case the switching to a preferred payment application is performed in a manner that is entirely invisible to the user.

In both cases, in addition to improvements in user experience, the number of instances in which an unexpected payment application is used to complete a transaction may be reduced. This is because the one or more rules can be consistently and uniformly applied to each and every transaction, producing reliable and repeatable outcomes. This aspect of the invention may therefore offer more reliable control of the improved ID device 220 in its role as a controller of the transaction.

From the perspective of the POI terminal 110, the entire transaction involved two payment actions, which actions are often referred to as ‘taps’ in a contactless payment environment. The first payment action, or first tap, involved a first payment application and resulted in a Try Again Outcome 194, i.e. no payment was effected with the first payment application. The second payment action, or second tap, involved a second payment application and resulted in a Proceed Outcome, i.e. a payment was effected with the second payment application.

In the case where the antenna of the improved ID device 220 was turned off and on, from the perspective of the POI terminal 110 this appears as the User 130 performing a second payment action, or second tap.

In both cases, it is not necessary to make any changes to the Software Development Kit (SDK) for the payment platform used by POI terminal 110 and improved ID device 220 to provide a framework for transactions to take place in the manner described in connection with FIGS. 5A and 5B. This advantageously enables currently deployed and even legacy POI terminals to support the advanced functionality associated with FIGS. 5A and 5B as described herein without the cost and effort associated with a firmware update.

From the perspective of the User 130, a first payment action, or first tap, is initiated. Two distinct user experiences are then possible.

In the case where the antenna of the improved ID device 220 is turned off and on, the User 130 may then receive a payment report that indicates the outcome of the transaction (e.g., approved, declined) and preferably indicates that a payment card other than the default payment card was used to effect payment in the case of the transaction being approved, or was attempted to effect payment in the case of the transaction being declined. In this case, the User 130 does not know that a second payment action, or tap, has in effect taken place, because the turning off and on of the antenna is invisible to the User 130.

In the case where an instruction is displayed to the User 130 to request that they remove and replace the improved ID device 220 from the field of the POI terminal 110, the user experiences this as a request to repeat the payment action, or tap. The user thus performs a second payment action, or second tap. Following this, the User 130 then receives a payment report as discussed in the immediately preceding paragraph.

In some scenarios it is necessary to authenticate the user, e.g. where the transaction is deemed to be a ‘High Value Transaction’. Preferably in such situations the authentication is handled at the same time as the user-intelligible instruction is displayed to the User 130 to request that they remove and replace the improved ID device 220 from the field of the POI terminal 110. This may prevent the User 130 from having to perform a third payment action, or third tap, in order to provide authentication.

In the case where the antenna is turned off and on, a message requesting authentication from the User 130 can be displayed by the improved ID device 220 prior to the improved ID device 220 transmitting the modified first and second set of parameters. The improved ID device 220 can await User 130 authentication and, once it has received this authentication, proceed to transmit an authentication credential along with the first set of parameters and second set of parameters to the POI terminal 110.

Many specific use cases are envisaged for the system of FIG. 5. Exemplary use cases are set out below to assist in the understanding of the invention. It will be appreciated, however, that the invention is not limited to any particular use case, or to the set of use cases described below, and as such further use cases will become apparent to a person skilled in the art having the benefit of the present disclosure.

A first use case is in the context of currency matching. It is assumed that at least two payment applications are available for use by the improved ID device 220. The first payment application is associated with a first currency and the second payment application is associated with a second, different currency.

User 130 initiates a transaction and the first payment application is selected. At the point of receipt of the confirmation request from POI terminal 110, the improved ID device 220 determines that the currency selected by the POI terminal 110 for the transaction does not match the first currency. The improved ID device 220 also determines that the second currency does match the currency selected by the POI terminal. The improved ID device 220 thus determines that it would be advantageous to complete the transaction using the second payment application, so that the currency of the payment application effecting payment matches the currency selected by the POI terminal.

The determination can be made based on one or more rules stored by the improved ID device 220, which rules govern behaviors of the improved ID device 220. In this particular context, a rule may exist that indicates that improved ID device 220 should respond with a Try Again Outcome 194 whenever a) the payment application that is currently in use does not have an associated currency that matches the currency selected by the POI terminal 110 and b) the improved ID device 220 has access to another payment application that has an associated currency that matches the currency selected by the POI.

Following the determination, the improved ID device 220 switches off the antenna used for communication with POI terminal 110, or displays an instruction to the User 130 to remove and replace the improved ID device 220 from the field generated by the POI terminal 110 as described above. Also as described above, whilst this process occurs, the improved ID device 220 modifies the payment application list such that going forward, the second payment application will be used in the transaction.

Upon switching on of the antenna, or the return of the improved ID device 220 to the field of the POI terminal 110, the transaction is restarted and proceeds using the second payment application. Accordingly, the transaction is completed, i.e. payment is effected, using a payment application having a currency that matches the currency selected by the POI terminal 110.

A second use case is in the context of transaction value. It is assumed that at least two payment applications available for use by improved ID device 220,. The first payment application has an associated first payment limit and the second payment application has an associated second payment limit, the second payment limit being greater than the first payment limit.

User 130 initiates a transaction and the first payment application is selected. At the point of receipt of the confirmation request from POI terminal 110, the improved ID device 220 determines that the transaction amount exceeds the first payment limit of the first payment application. The improved ID device 220 also determines that the transaction amount does not exceed the second payment limit of the second payment application. The improved ID device 220 thus determines that it would be advantageous to complete the transaction using the second payment application.

The determination can be made based on the aforementioned one or more rules stored by the improved ID device 220, which rules govern behaviors of the improved ID device 220. In this particular context, a rule may exist that indicates that improved ID device 220 should respond with a Try Again Outcome 194 whenever a) the payment application that is currently in use has a payment limit that is lower than a transaction amount and b) the improved ID device 220 has access to another payment application that has an associated payment limit that exceeds the transaction amount.

Following the determination, the improved ID device 220 switches off the antenna used for communication with POI terminal 110, or displays an instruction to the User 130 to remove and replace the improved ID device 220 from the field generated by the POI terminal 110 as described above. Also as described above, whilst this process occurs, the improved ID device 220 modifies the payment application list such that going forward, the second payment application will be used in the transaction.

Upon switching on of the antenna, or the return of the improved ID device 220 to the field of the POI terminal 110, the transaction is restarted and proceeds using the second payment application. Accordingly, the transaction is completed, i.e. payment is effected, using a payment application having a payment limit that exceeds the transaction amount.

A third use case is in the context of merchant identification. It is assumed that at least two payment applications are available for use by improved ID device 220. The first payment application has an association with a first merchant, or no merchant association, and the second payment application has an association with a second merchant, the second merchant being different from the first merchant (if present).

User 130 initiates a transaction and the first payment application is selected. At the point of receipt of the confirmation request from POI terminal 110, the improved ID device 220 determines that the merchant associated with the POI terminal 110 does not match the first merchant, or that the first payment application has no associated merchant. The improved ID device 220 also determines that the merchant associated with the POI terminal 110 does match the second merchant associated with the second payment application. The improved ID device 220 thus determines that it would be advantageous to complete the transaction using the second payment application.

The determination can be made based on the aforementioned one or more rules stored by the improved ID device 220, which rules govern behaviors of the improved ID device 220. In this particular context, a rule may exist that indicates that improved ID device 220 should respond with a Try Again Outcome 194 whenever a) the payment application that is currently in use does not match a merchant identifier associated with the POI terminal 110 (here, ‘does not match’ includes the situation where the highest priority payment application has no associated merchant) and b) the improved ID device 220 has access to another payment application that has an associated second merchant that does match the merchant identifier associated with the POI terminal 110.

Following the determination, the improved ID device 220 switches off the antenna used for communication with POI terminal 110, or displays an instruction to the User 130 to remove and replace the improved ID device 220 from the field generated by the POI terminal 110 as described above. Also as described above, whilst this process occurs, the improved ID device 220 modifies the payment application list such that going forward, the second payment application will be used in the transaction.

Upon switching on of the antenna, or the return of the improved ID device 220 to the field of the POI terminal 110, the transaction is restarted and proceeds using the second payment application. Accordingly, the transaction is completed, i.e. payment is effected, using a payment application having an associated merchant that matches a merchant associated with the POI terminal 110.

It will be appreciated that the merchant identification of the third use case may be assigned to each payment application by the User 130. This can enable, for example, the User 130 to designate one or more merchants as ‘business’ merchants, and one or more merchants as ‘personal’ merchants. Merchants with the designation ‘business’ may be those that the User 130 wishes to use a corporate payment application as the default to effect payment, and merchants with the designation ‘personal’ may be those that the User 130 wishes to use a personal payment application as the default to effect payment. The implementation of the third example may thus allow the User 130 to reduce the burden with selecting a corporate or personal account for effecting payment, and may also reduce the possibility of the User 130 unknowingly making a payment with a personal payment application where a business payment application was intended, or vice versa.

A fourth use case is in the context of a merchant that also acts as a card issuer. It is assumed that at least two payment applications are available for use by improved ID device 220. The first payment application is not issued by the merchant, and the second payment application is issued by the merchant.

User 130 initiates a transaction and the first payment application is selected. At or before the point of receipt of the confirmation request from the POI terminal 110, the improved ID device 220 determines that the merchant acts as a card issuer. This determination can be based upon the content of a custom data field of an EMV-compliant message received by the improved ID device 220 from the POI terminal 110.

The EMV-compliant message can be, for example, a Card Risk Management Data Object List 1 (CDOL1) message or a Processing Options Data Object List (PDOL) message as are known in the art per se. The custom data field can be a ‘merchant custom data’ field as is known in the art per se (tag 9F7C of EMV level 2 kernel). The custom data field includes at least a merchant unique identifier that enables the improved ID device 220 to identify the merchant and further identify that the merchant is acting as an issuer.

The custom data field can be populated by the POI terminal in response to a request for merchant issuer information from the improved ID device 220. This could take the form of an overloaded PDOL message, for example.

POI terminals not associated with the merchant acting as an issuer would not act on such a request, having no merchant unique identifier to populate the custom data field with. This use case is thus compatible with POI terminals of merchants not acting as issuers, and POI terminals not configured to respond to requests for merchant issuer information.

Upon receipt of a merchant unique identifier, the improved ID device 220 determines that the second payment application is issued by the merchant. This could be achieved, for example, by matching the merchant unique identifier received from the POI terminal 110 to a merchant unique identifier stored in the application payment list in association with the second payment application.

On this basis, the improved ID device 220 determines that it would be advantageous to complete the transaction using the second payment application.

The determination can be made based on the aforementioned one or more rules stored by the improved ID device 220, which rules govern behaviors of the improved ID device 220. In this particular context, a rule may exist that indicates that improved ID device 220 should respond with a Try Again Outcome 194 whenever a) the improved ID device 220 receives a valid response to a request for a merchant unique identifier; and b) the merchant unique identifier received in the response matches a merchant unique identifier of another payment application that the improved ID device 220 has access to.

Following the determination, the improved ID device 220 switches off the antenna used for communication with POI terminal 110, or displays an instruction to the

User 130 to remove and replace the improved ID device 220 from the field generated by the POI terminal 110 as described above. Also as described above, whilst this process occurs, the improved ID device 220 modifies the payment application list such that going forward, the second payment application will be used in the transaction.

Upon switching on of the antenna, or the return of the improved ID device 220 to the field of the POI terminal 110, the transaction is restarted and proceeds using the second payment application. Accordingly, the transaction is completed, i.e. payment is effected, using a payment application that is issued by the merchant. This may enable the User 130 to receive additional benefits afforded to customers of the merchant that use payment applications issued by the merchant to effect payment, with minimal or even no effort on the part of the User 130.

It will also be appreciated that composite rules can be defined, e.g. ‘use a payment application to effect payment that matches the currency of the POI terminal 110 unless the transaction amount exceeds the payment limit associated with the payment application, in which case a payment application which does not match the currency of the POI terminal 110 but which does have a payment limit that is greater than the transaction amount is to be used’. Rules can be defined based on input from User 130, e.g. via a ‘preferences’ or ‘options’ portion of a payment application, and/or rules can be defined based on input from one or more other parties including merchants, payment card issuing organizations, financial institutions, etc.

Advantageously, the techniques described herein can be combined with techniques disclosed in Applicant's published patent application WO 2018/106378 A1, the content of which is incorporated herein by reference in its entirety. This patent application describes techniques in which the current location of a user, as determined by a user device such as improved ID device 220, is used to automatically select one of a plurality of digitized cards associated with a digital wallet application. In the context of the present disclosure these techniques can be used to increase the probability that the first payment application meets the user's needs, at least in respect of currency, because of the (usually reasonably accurate) association between physical location and accepted currency. Thus, the probability that the first payment application needs to be replaced with another payment application in order to complete the transaction in an optimal manner may be reduced compared to scenarios where the user's current location is not used to set the first payment application. Techniques disclosed herein still have utility in such circumstances, however, as they provide a backstop for use in the event where the enhanced selection based on user location nevertheless still results in a suboptimal selection for the payment application.

By implementing a user-configurable payment transaction restart 152 according to the invention, new functionalities may be quickly provided to the User 130 without requiring POI terminals that are no longer EMV-compliant. This is particularly advantageous for digital (mobile) devices 124 comprising one or more virtual contactless ID device 120—the current version of EMV contactless specifications and protocols provide no convenient way to pause the transaction 100 in order to select between different contactless ID devices 120 (or virtual contactless cards 120) comprised in the mobile device 124. Currently, every wallet application on the device 124 may only present one virtual contactless card 120 to avoid possible confusion about the contactless card 120 to be selected to participate in the transaction 100, and to be used to complete the payment. Conventionally, this is typically the virtual contactless card 120 selected by default, or explicitly selected by the user 130 prior to tapping.

Currently, if multiple payment applications (identified by an appropriate AID) are comprised in the PPSE of a contactless ID device 120, and multiple AIDs may be processed by a POI terminal 110, the POI terminal 110 selects the AID having the highest priority in the PPSE. If the priorities are equal, the first entry in the PPSE is selected. This is often very confusing for the User 130 who does not know in advance the capabilities of a POI terminal 110 to support a payment application, and therefore has little control, in some cases no control, of the payment application selected to complete the payment transaction 100.

Providing only one AID in the PPSE may also be considered to improve control with conventional payment transactions 100—the User 130 may select a payment application corresponding to the AID as the default payment application. However, this remains disadvantageous—if the payment application, indicated by the AID, is not supported by the POI terminal 110, the transaction 100 may be declined. The merchant must start a new transaction 100, and only if the User 130 realises why the transaction 100 has been declined, the User 130 may select a different payment application as default.

By implementing a user-configurable payment transaction restart 152 according to the invention, the User 130 may be prompted to either resolve any conflict or to make a deliberate choice for a payment application without requiring a new transaction 200 to be started. In the case of the techniques of FIGS. 5A and 5B, the payment transaction can be restarted without additional user input, and in some cases in a manner that is entirely invisible to the User 130. So the improved payment transaction 200 is still preferred.

In particular, additional functionalities provided by mobile devices 224 may be more fully utilized to improve the convenience and usability of payment transactions for the user 130.

Additionally, an improved mobile device 224 may be further configured and arranged to inform the User 130 that he cannot pay at a POI terminal 110 because he is missing a compatible payment application (payment instrument). He may then also be provided with a download link or a button to select.

As will be obvious to the person skilled in the art, the user-configurable payment transaction restart 152 may also be used for any functionality or option useful for the user 130 during, for example, an authentication transaction, an authorization transaction, a coupon-redeeming transaction, a bidding transaction, a quoting transaction, a negotiation transaction, or any combination thereof.

As used herein and in the appended claims, the term “processor” should be understood to encompass a single processor or two or more processors in communication with each other.

The flow charts and descriptions thereof herein should not be understood to prescribe a fixed order of performing the method steps described therein. Rather the method steps may be performed in any order that is practicable. Similarly, the coding examples are used to explain the algorithm, and are not intended to represent the only implementations of these algorithms—the person skilled in the art will be able to conceive many different ways to achieve the same functionality as provided by the embodiments described herein.

Although the present invention has been described in connection with specific exemplary embodiments, it should be understood that various changes, substitutions, and alterations apparent to those skilled in the art can be made to the disclosed embodiments without departing from the spirit and scope of the invention as set forth in the appended claims.

Additional embodiments of the invention are set out in the following enumerated clauses.

Clause 1. A computer-implemented payment transaction method (100, 200) comprising:

-   -   executing payment transactions with an identification device         (120, 220) at a processor of a POI terminal (110)by interaction         in accordance with a standard EMV Contactless payment         transaction protocol;     -   operating a Proximity Payment System Environment (PPSE) having         at least a first and a second payment application at a further         processor of the identification device (120, 220);     -   inputting to the further processor of the identification device         (120, 220) via a user interface (230, 224, 222);     -   commencing, by the POI terminal (110), an EMV-compliant payment         transaction with the identification device (120, 220) by         selecting the PPSE;     -   receiving, by the POI terminal (110), parameters from the         identification device (120, 220) associated with the first and         second payment applications;     -   determining the compatibility of the first and second payment         applications for participating in the EMV-compliant payment         transaction with the POI terminal (110);     -   selecting, by the POI terminal (110), either the first or second         payment application as preferred to continue the payment         transaction (100, 200) using the compatibilities and the         parameters, and communicating the POI-selected payment         application to the identification device (120, 220);     -   receiving from the user interface (230) a selection of either         the first or second payment application and modifying the PPSE         accordingly;     -   receiving, by the POI terminal (110), an EMV-compliant response         from the identification device (220) configured and arranged to         restart said payment transaction (200);     -   continuing, by the POI terminal (110), said EMV-compliant         payment transaction (200) by selecting the modified PPSE of the         identification device (220); and     -   selecting, by the POI terminal (110), the user-selected payment         application to continue the payment transaction (200).

Clause 2. The method of Clause 1, wherein the EMV-compliant response from the identification device (222), configured and arranged to restart said payment transaction (200), comprises one or more of the following:

-   -   a Try Again indication;     -   an End Application (with restart) indication;     -   a communications error.

Clause 3. The method of Clause 1 or 2, the method further comprising:

-   -   before commencing the payment transaction by selecting the         unmodified PPSE, a payment amount is first examined by the         POI-terminal (112) comparing the amount with transactional         limits; and     -   after restarting said payment transaction (200), the comparison         of the payment amount with the transactional limits is bypassed.

Clause 4. The method of Clause 1 or 2, the EMV-compliant payment transaction using Entry Point (150) comprising a Protocol Activation step (157), the method further comprising:

-   -   restarting said payment transaction (200) by restarting the         Protocol Activation step (157) of the Entry Point (150).

Clause 5. The method of Clause 1 or 2, wherein:

-   -   the identification device (220) and the user interface (124,         224) are comprised in a mobile device or a mobile telephone         (124, 224).

Clause 6. The method of Clause 1 or 2, wherein:

-   -   the user interface (124, 224) is comprised in the POI terminal.

Clause 7. The method of Clause 1 or 2, wherein:

-   -   the POI terminal further comprises a POI display (115); the         method further comprising:     -   further prompting the user (130) to select either the first or         second payment application by providing a message on the POI         display (115).

Clause 8. The method of Clause 1 or 2, wherein the method further comprises:

-   -   modifying the PPSE by:     -   modifying one or more priority indications associated with the         first and/or second payment application; and/or     -   modifying the order associated with the first and/or second         payment application.

Clause 9. The method of Clause 1 or 2, wherein the method further comprises:

-   -   modifying the PPSE to comprise only one payment application.

Clause 10. The method of Clause 1 or 2, wherein the identification device is comprised in an integrated circuit, a bio-sensor, a medical implant, a contacted card, a contactless card, a portable electronic device, a SIM module, a mobile communications device, a mobile computer, a remote server, or any combination thereof.

Clause 11. The method of Clause 1 or 2, wherein the POI terminal is configured to interact (140, 240) with said one of the identification devices using electrical contact, close coupling, proximity coupling, electromagnetic radiation, visible or non-visible light, NFC, RF, Bluetooth, WiFi, mobile data, LAN, USB, HTTP, HTTPS, XMPP, web sockets, FTP, or any combination thereof.

Clause 12. An identification device (220), comprising a processor, the processor being programmed to execute to execute payment transactions with a POI terminal (110) by interaction in accordance with a standard EMV Contactless payment transaction protocol;

the processor being further programmed to:

-   -   provide a Proximity Payment System Environment (PPSE) having at         least a first and a second payment application;     -   receive inputs from a user interface (124, 224);     -   allow commencement, by the POI terminal (110), of an         EMV-compliant payment transaction with the identification device         (120, 220) by selecting the PPSE;     -   send, to the POI terminal (110), parameters from the         identification device (120, 220) associated with the first and         second payment applications;     -   receive the POI-selected payment application, selected by the         POI terminal (110) using compatibilities and parameters, to         continue the payment transaction (100, 200),     -   store the user (130) selection provided using the user interface         (224) of either the first or second payment application;     -   send, to the POI terminal (110), an EMV-compliant response from         the identification device (220) configured and arranged to         restart the payment transaction (200);     -   allow continuation, by the POI terminal (110), of said         EMV-compliant payment transaction (200) by selecting the PPSE;         and     -   receive, from the POI terminal (110), the user-selected payment         application to continue the payment transaction (200).

Clause 13. A mobile device (124, 224) comprising:

-   -   the identification device (220) according to Clause 12, and     -   the user interface (124, 224).

REFERENCE NUMBERS USED IN DRAWINGS

-   100 ID (Identification) transaction -   110 POI (Point of Interaction) Terminal -   112 POS (Point of Service) Terminal -   115 POI display -   120 Contactless ID (Identification) Device -   122 Contactless Chipcard -   124 Mobile Device -   130 User or Consumer -   140 EMV-compliant contactless interaction channel -   150 Entry Point (High Level Architecture) -   151 Start A -   152 Start B -   153 Start C -   154 Start D -   155 Preliminary transaction processing or Pre-Processing -   157 Protocol Activation -   160 Combination Selection -   162 SELECT (PPSE) command -   164 First File Control Information (FCI) response -   166 SELECT (AID) command -   170 Kernel Activation -   175 Second File Control Information (FCI) response -   180 Kernel Processing -   182 Command APDU's (C-APDU) -   184 Response APDU's (R-APDU) -   190 Outcome Processing -   192 Select Next Outcome -   194 Try Again Outcome -   196 Final Outcomes -   200 Improved payment transaction -   220 Improved ID Device -   222 Improved Contactless Chipcard -   224 Improved Mobile Device -   230 User interface -   260 Prompt user for input -   284 Modified response TRY AGAIN 

1. A computer-implemented transaction method performed by a processor of an identification device, the method comprising: operating an environment including an application list comprising at least one first application parameter that is associated with a first application; transmitting, to a Point of Interaction, POI, terminal and using an antenna of the identification device, the application list; receiving, from the POI terminal and using the antenna, a first request for confirmation that a transaction should proceed using the first application; applying one or more rules to data contained within the first request; determining, based on the application of the one or more rules, that the transaction is to proceed using a second, different application instead of the first application; transmitting, to the POI terminal and using the antenna, a response for restarting the transaction; modifying the application list to generate a modified application list, the modified application list comprising at least one second application parameter that is associated with the second application; performing a further action comprising: displaying a user-intelligible instruction on a display of the identification device, the user-intelligible instruction requesting that the identification device is removed from a field generated by the POI terminal and subsequently placed back within said field; or disabling the antenna and subsequently enabling the antenna after a predetermined time has elapsed; transmitting, to the POI terminal and using the antenna, the modified application list; receiving, from the POI terminal and using the antenna, a second request for confirmation that the transaction should proceed using the second application; and transmitting, to the POI terminal and using the antenna, a response to the second request.
 2. The computer-implemented transaction method of claim 1, wherein modifying the application list to generate the modified application list further comprises: removing the at least one first application parameter from the application list; and adding the at least one second application parameter to the application list.
 3. The computer-implemented transaction method of claim 1, wherein the application list further comprises: the at least one second application parameter, a first application priority value; and a second application priority value; wherein modifying the application list to generate the modified application list further comprises: modifying the first priority value and/or the second priority value such that a priority of the second application is higher than a priority of the first application.
 4. The computer-implemented transaction method of claim 1, wherein the response for restarting the transaction is a response that causes the POI terminal avoid having to carry out a pre-processing stage in which at least a payment amount and payment currency are specified.
 5. The computer-implemented transaction method of claim 1, wherein the response to the second request comprises an authorization message or a decline message.
 6. The computer-implemented transaction method of claim 1, wherein the user-intelligible instruction comprises text and/or at least one image.
 7. The computer-implemented transaction method of claim 1, wherein the one or more rules comprise any one or more of the following: a currency rule specifying that the response for restarting the transaction is to be transmitted where it is determined that a currency of the transaction does not match a currency associated with the first application, and that a currency associated with the second application does match the currency of the transaction; a threshold value rule specifying that a response for restarting the transaction is to be transmitted where it is determined that a value of the transaction exceeds a threshold value associated with the first application, and that the value of the transaction does not exceed a threshold value associated with the second application; and a merchant identity rule specifying that a response for restarting the transaction is to be transmitted where it is determined that a POI terminal merchant identifier that is associated with the POI terminal does not match a merchant identifier associated with the first application, and that the POI terminal merchant identifier does match a merchant identifier associated with the second application.
 8. The computer-implemented transaction method of claim 1, wherein the identification device comprises a contactless chipcard or a software application executing on a mobile device, preferably wherein the mobile device is a mobile phone.
 9. The computer-implemented transaction method of claim 1, further comprising: transmitting, to the POI terminal and using the antenna, a request for a merchant unique identifier; and receiving, from the POI terminal and using the antenna, a message including a field populated with the merchant unique identifier; wherein determining, based on the application of the one or more rules, that the transaction is to proceed using the second, different application instead of the first application further comprises: determining that the second application is associated with the merchant unique identifier; and based on the determining, selecting the second application for continuing the transaction.
 10. A non-transitory computer-readable medium storing program instructions that, when executed by a processor of an identification device, cause the identification device to: operate an environment including an application list comprising at least one first application parameter that is associated with a first application; transmit, to a Point of Interaction, POI, terminal and using an antenna of the identification device, the application list; receive, from the POI terminal and using the antenna, a first request for confirmation that a transaction should proceed using the first application; apply one or more rules to data contained within the first request; determine, based on the application of the one or more rules, that the transaction is to proceed using a second, different application instead of the first application; transmit, to the POI terminal and using the antenna, a response for restarting the transaction; modify the application list to generate a modified application list, the modified application list comprising at least one second application parameter that is associated with the second application; perform a further action comprising: displaying a user-intelligible instruction on a display of the identification device, the user-intelligible instruction requesting that the identification device is removed from a field generated by the POI terminal and subsequently placed back within said field; or disabling the antenna and subsequently enabling the antenna after a predetermined time has elapsed; transmit, to the POI terminal and using the antenna, the modified application list; receive, from the POI terminal and using the antenna, a second request for confirmation that the transaction should proceed using the second application; and transmit, to the POI terminal and using the antenna, a response to the second request.
 11. The non-transitory computer-readable medium of claim 10, wherein, as part of modifying the application list to generate the modified application list, the identification device is caused to: remove the at least one first application parameter from the application list; and add the at least one second application parameter to the application list.
 12. The non-transitory computer-readable medium of claim 10, wherein the application list further comprises: the at least one second application parameter, a first application priority value; and a second application priority value; wherein, as part of modifying the application list to generate the modified application list, the identification device is caused to: modify the first priority value and/or the second priority value such that a priority of the second application is higher than a priority of the first application.
 13. The non-transitory computer-readable medium of claim 10, wherein the response for restarting the transaction is a response that causes the POI terminal avoid having to carry out a pre-processing stage in which at least a payment amount and payment currency are specified.
 14. The non-transitory computer-readable medium of claim 10, wherein the one or more rules comprise any one or more of the following: a currency rule specifying that the response for restarting the transaction is to be transmitted where it is determined that a currency of the transaction does not match a currency associated with the first application, and that a currency associated with the second application does match the currency of the transaction; a threshold value rule specifying that a response for restarting the transaction is to be transmitted where it is determined that a value of the transaction exceeds a threshold value associated with the first application, and that the value of the transaction does not exceed a threshold value associated with the second application; and a merchant identity rule specifying that a response for restarting the transaction is to be transmitted where it is determined that a POI terminal merchant identifier that is associated with the POI terminal does not match a merchant identifier associated with the first application, and that the POI terminal merchant identifier does match a merchant identifier associated with the second application.
 15. An identification device comprising a processor, the processor configured to cause the identification device to: operate an environment including an application list comprising at least one first application parameter that is associated with a first application; transmit, to a Point of Interaction, POI, terminal and using an antenna of the identification device, the application list; receive, from the POI terminal and using the antenna, a first request for confirmation that a transaction should proceed using the first application; apply one or more rules to data contained within the first request; determine, based on the application of the one or more rules, that the transaction is to proceed using a second, different application instead of the first application; transmit, to the POI terminal and using the antenna, a response for restarting the transaction; modify the application list to generate a modified application list, the modified application list comprising at least one second application parameter that is associated with the second application; perform a further action comprising: displaying a user-intelligible instruction on a display of the identification device, the user-intelligible instruction requesting that the identification device is removed from a field generated by the POI terminal and subsequently placed back within said field; or disabling the antenna and subsequently enabling the antenna after a predetermined time has elapsed; transmit, to the POI terminal and using the antenna, the modified application list; receive, from the POI terminal and using the antenna, a second request for confirmation that the transaction should proceed using the second application; and transmit, to the POI terminal and using the antenna, a response to the second request.
 16. The identification device of claim 15, wherein, as part of modifying the application list to generate the modified application list, the identification device is caused to: remove the at least one first application parameter from the application list; and add the at least one second application parameter to the application list.
 17. The identification device of claim 15, wherein the application list further comprises: the at least one second application parameter, a first application priority value; and a second application priority value; wherein, as part of modifying the application list to generate the modified application list, the identification device is caused to: modify the first priority value and/or the second priority value such that a priority of the second application is higher than a priority of the first application.
 18. The identification device of claim 15, wherein the response for restarting the transaction is a response that causes the POI terminal avoid having to carry out a pre-processing stage in which at least a payment amount and payment currency are specified.
 19. The identification device of claim 15, wherein the one or more rules comprise any one or more of the following: a currency rule specifying that the response for restarting the transaction is to be transmitted where it is determined that a currency of the transaction does not match a currency associated with the first application, and that a currency associated with the second application does match the currency of the transaction; a threshold value rule specifying that a response for restarting the transaction is to be transmitted where it is determined that a value of the transaction exceeds a threshold value associated with the first application, and that the value of the transaction does not exceed a threshold value associated with the second application; and a merchant identity rule specifying that a response for restarting the transaction is to be transmitted where it is determined that a POI terminal merchant identifier that is associated with the POI terminal does not match a merchant identifier associated with the first application, and that the POI terminal merchant identifier does match a merchant identifier associated with the second application.
 20. The identification device of claim 15, wherein the identification device is one of: a contactless chipcard; and a mobile device, preferably a mobile phone. 